Thor Motor Coach-Magnitude Super C RV Exposed: Water Leaks, Slide Issues, Warranty Ping-Pong

Introduction: What Shoppers Should Know About the Thor Motor Coach Magnitude Super C

AI-powered research tools have systematically collected and analyzed public information to produce this report. The Thor Motor Coach Magnitude Super C is a diesel-powered “Super C” motorhome typically built on Ford’s F-550 or F-600 chassis. On paper, the Magnitude promises serious towing capability, big off-grid batteries/solar options, and residential comforts in a rugged platform. In owner communities and consumer complaint channels, however, this model is frequently associated with workmanship defects, water leaks, slide-out problems, electrical and plumbing issues, lengthy service delays, and warranty frustrations. While some owners report positive experiences, the weight of complaints in recent years suggests persistent quality and after-sale support concerns that prospective buyers should examine closely.

If you currently own a Magnitude Super C or have shopped for one recently, what did you encounter at delivery and during your first year of use? Tell other shoppers what you’ve experienced.

Where to Research Unfiltered Owner Experiences

Before you buy, dig into owner discussions, complaint databases, and recall notices. Use the following resources and search queries to verify and compare the issues raised below:

• YouTube owner reports and walkthroughs: YouTube: Thor Motor Coach Magnitude Super C Problems
• Google reviews and complaints: Google: Thor Motor Coach Magnitude Super C Problems
• BBB: Search by brand and model to see patterns in complaints and responses: BBB: Thor Motor Coach Magnitude Super C
• Reddit owner threads:
  • r/rvs: Thor Motor Coach Magnitude Super C Problems
  • r/RVLiving: Thor Motor Coach Magnitude Super C Problems
  • r/GoRVing: Thor Motor Coach Magnitude Super C Problems
• RVInsider owner reviews: RVInsider: Thor Motor Coach Magnitude Super C Problems
• Good Sam forum threads: Good Sam Community: Magnitude Super C Problems
• NHTSA recalls and safety complaints: NHTSA: Thor Motor Coach Magnitude Super C
• PissedConsumer: Go to PissedConsumer home page and search for “Thor Motor Coach Magnitude Super C.”
• RV communities and forums: Use the site search to look up the Magnitude Super C:
  • RVForums.com
  • RVForum.net
  • RVUSA Forum
• Facebook owner groups: Join multiple groups for unfiltered feedback: Google: Thor Motor Coach Magnitude Super C Facebook Groups

Independent voices like Liz Amazing are widely cited by RV shoppers for exposing industry-wide quality and service pitfalls. See her channel and search for your model: Liz Amazing’s RV consumer advocacy videos.

Before You Buy: Arrange an Independent RV Inspection

We strongly recommend a third-party inspection before you sign final paperwork or take delivery. This is your leverage point—after the sale, many buyers report being pushed to the back of the service line while parts trickle in. Use a local search to book a certified inspector: Find RV inspectors near you.

• Why it matters: Numerous owners describe cancelled trips, months-long downtime, and ongoing warranty disputes when issues surface post-delivery.
• What to include in the inspection:
  • Full water intrusion test (spray test) focusing on cabover seams, slide housings, roof penetrations, windows, and rear cap
  • Slide-out operation, alignment, seals, toppers, and gear/synchronization checks
  • Electrical system: inverter/charger, transfer switch, battery health, solar controller settings, GFCI/12V circuits
  • Plumbing: PEX fittings, pump, water heater, tank sensors, venting and traps
  • Chassis: axle weights with full fuel/water and gear; steering alignment; tire load/age; brake function
  • Appliances and HVAC: real-world cooling/heating performance and duct leakage
  • Fit/finish: cabinet anchoring, trim adhesion, latches, drawers, hinges, and rattles

If you’ve hired an inspector for a Magnitude before, would you recommend it to others? Add your inspection tips in the comments.

Workmanship and Build Quality: Common Owner-Reported Problems

Water Intrusion: Cabover, Slide Rooms, and Roof Seams

• Consequences: Structural rot, delamination, health hazards from mold, diminished resale value.
• Owner tip: Keep a moisture meter on hand and inspect high-risk seams monthly; document early for warranty claims.
• Reference channels: Good Sam: Magnitude Super C Leaks, Reddit: Magnitude Super C Leaks.

Slide-Out Alignment, Motors, and Toppers

• Tell-tale signs on walkthrough: Uneven gaps, scuffed flooring at slide edges, toppers pooling, seals pinched or sliced.
• Owner advice: Run slides in/out multiple times at delivery; request documentation of slide system alignment specifications.

Interior Fit/Finish: Cabinets, Latches, and Trim

• Impact: Frequent repair visits and squeaks/rattles that make driving fatiguing.
• What to test at delivery: Tug on upper cabinets, cycle every latch, and drive at highway speeds to surface noises.

Electrical System: Inverter/Charger, Transfer Switch, and 12V Wiring

• Risk: Fire hazard, appliance damage, ruined batteries, intermittent camping capability.
• Inspection must-do: Load test the system (ACs, microwave) on shore power, generator, and inverter modes; check torque on major lugs; verify charger settings for your battery chemistry.

Plumbing: Leaks, PEX Fittings, and Tank Sensors

• Tip: Pressure-test plumbing during inspection and check every accessible fitting after a drive (vibration exposes weak joints).

HVAC Performance and Ducting

Exterior and Roof Components

Doors, Windows, and Seals

Chassis and Drivability: Ford F-550/F-600 Platform Considerations

Weight, Payload, and Axle Ratings

• Action: Get a certified four-corner weight. Adjust loading to keep axles under GAWR and tires within load index.

Steering, Wander, and Sway

Driveline, Braking, and Service Access

Service, Warranty, and Parts Delays

Warranty Ping-Pong Between Thor and Component Vendors

Dealer Backlogs and Parts Shortages

Industry watchdog content can help you prepare for these realities and negotiate better up front. See: Liz Amazing’s reporting on RV warranty and dealer delays. Search her channel for “Magnitude Super C” or similar terms for model-specific content.

Has your Magnitude been stuck for weeks awaiting parts? Add your service timeline to help others.

Options, Pricing, and Feature Reality Check

Solar and Off-Grid Packages vs. Real-World Performance

Overpriced Add-Ons and Dealer Packaged Fees

Recalls and Safety Advisories: What to Check

Recalls can affect either the coach “house” (wiring routing, propane systems, seat belt anchorage, etc.) or the Ford chassis (steering, driveline, braking). The only authoritative way to know what applies to your unit is to run the VIN at NHTSA and confirm with your dealer:

• NHTSA: Thor Motor Coach Magnitude Super C — check safety recalls, investigations, and complaints
• Search owner recall discussions: Google: Magnitude Super C Recalls

After purchase, schedule recall work promptly and keep written proof. If you encounter safety defects without an existing recall, file a complaint with NHTSA—this helps trigger investigations.

Legal and Regulatory Warnings

• Magnuson-Moss Warranty Act (Federal): Requires clear warranty terms and prohibits tying warranty coverage to branded service parts. If your valid claim is denied or unreasonably delayed, you may have remedies. Track dates and correspondence.
• State Lemon Laws: Some states cover motorhomes’ chassis and house components; others have exclusions or different thresholds. Review your state’s law and timelines for “reasonable number of repair attempts” and “days out of service.”
• Implied Warranties & UCC: Even when a written warranty is short, implied warranties of merchantability may apply unless lawfully disclaimed. Chronic, unresolved defects affecting usability can implicate these protections.
• NHTSA Safety Defects: If your Magnitude exhibits a safety defect (e.g., brake failure, steering loss, fuel leak), file at NHTSA to document patterns. Keep repair orders and photos.
• FTC and State UDAP Laws: Claims in advertising that are materially misleading can implicate unfair or deceptive acts or practices statutes. Save brochures and screenshots if promised features underperform.

If your service center is not addressing reasonable defects within warranty, consider a written demand letter, escalation to Thor Motor Coach corporate, and consultation with a consumer protection attorney. Document every step. If you’ve pursued arbitration or a lemon claim on a Magnitude, what outcome did you get?

Product and Safety Impact Analysis

• Water Intrusion: High risk to structural integrity and health; remediation can be invasive and expensive. Insurance may deny coverage if deemed maintenance-related.
• Electrical Defects: Fire risk is nontrivial when lugs are loose or wiring is undersized. Inverters and transfer switches must be properly torqued and ventilated.
• Slide-Out Failures: Slide malfunctions away from home can strand travelers, compromise weather sealing, and lead to costly transport to service facilities.
• Chassis Overweighting: Operating near axle limits reduces tire life, strains brakes, and can contribute to handling instability—especially in emergency maneuvers.
• Service Delays: Financially, months without use erode the value of a premium purchase and can cause families to miss major trips. Rental or hotel substitutions add cost.

To mitigate these risks, have a certified inspector weigh the coach as-delivered, perform a water intrusion test, and bench-test electrical loads. Book your own inspector: independent RV inspectors near you.

For additional industry context on safety-impacting defects and owner remedies, explore consumer advocates like Liz Amazing’s investigative episodes and search her channel for “Magnitude Super C.”

Pre-Delivery Inspection (PDI): A Checklist for the Magnitude Super C

Bring your inspector or spend a full day at the dealership to vet the coach. Do not accept delivery until all defects are corrected in writing.

• Water test: Continuous spray at cabover corners, slide flanges, roof seams, rear cap, and every window. Open panels and look for drips.
• Slide test: Cycle each slide 5+ times; inspect seals after cycles; verify toppers drain water and fabric doesn’t chafe.
• Electrical: Check inverter under load, transfer switch changeover, GFCI outlets, thermostat controls, and battery charge rates. Feel for hot smells or warm lugs.
• Plumbing: Pressurize system; look under sinks, behind access panels; fill/empty tanks and verify sensor accuracy; check water heater and winterization valves.
• Chassis/drive: Highway drive with salesperson aboard; assess steering, braking, wind noise, rattles. Get alignment printout if needed.
• Fit/finish: Open/close every cabinet and drawer; secure loose trim and latches before signing.
• Documentation: Demand a written due bill for any outstanding items and a parts order confirmation with ETA.

If you already own a Magnitude, which PDI items would you add to this list? Share your best PDI advice.

Owner Narratives: What the Complaint Patterns Look Like

Aggregated reviews and forum posts repeatedly tell a similar story: initial excitement, early discovery of leaks or slide/electrical quirks, followed by service backlogs and backorders. Some buyers report successful outcomes after persistent escalation; others describe prolonged downtime and loss of confidence. To cross-check these narratives, read owner accounts on:

• YouTube: Magnitude Super C complaints
• Google: Magnitude Super C owner reviews
• Good Sam: Magnitude Super C Issues

For broader industry context on avoiding lemons and negotiating repairs, many shoppers find this channel helpful: Explore Liz Amazing’s RV consumer guides.

Signs of Incremental Improvement (But Keep Expectations Grounded)

Some recent Magnitude variants on upgraded chassis (e.g., F-600) and evolving factory processes may offer better payload margins or feature packages than earlier runs. A subset of owners report relatively smooth first seasons with only minor punch-list items. Additionally, specific recalls have been issued and resolved for certain units through dealers. That said, the overall pattern in consumer reporting still indicates that quality control and after-sale support do not reliably match the coach’s price point. Buyers should plan for a thorough PDI, an immediate short shakedown trip near home, and proactive warranty escalation if problems surface.

Action Plan for Prospective Buyers

• Get a pre-purchase inspection: Book an independent expert: RV Inspectors near me.
• Demand data: Ask the dealer for an axle weight ticket (full fuel/propane/water) and proof of PDI results. Verify slide operation and roof sealing on the spot.
• Negotiate service terms: Secure priority scheduling for post-delivery punch lists and written assurance for parts ordering times.
• Research complaints and recalls: Use the links above (NHTSA, BBB, forums) to set realistic expectations for support and downtime.
• Budget for upgrades: Many owners add suspension aids, sealant maintenance, and electrical tuning early. Factor this into total cost.

Have you negotiated successful “service priority” terms into a Magnitude purchase? What worked for you?

Key Citations and Owner Research Links (Revisited)

• Google search: Thor Motor Coach Magnitude Super C Problems
• YouTube search: Magnitude Super C Problems
• BBB: Thor Motor Coach Magnitude Super C
• Reddit r/rvs threads: Magnitude Super C Problems
• NHTSA recalls: Magnitude Super C
• RVInsider: Owner reviews for Magnitude Super C
• Good Sam Community: Magnitude Super C Problems
• Google: Magnitude Super C Facebook Groups
• PissedConsumer: Search for Thor Motor Coach Magnitude Super C

Bottom Line and Recommendation

The Thor Motor Coach Magnitude Super C’s promise—diesel muscle, big towing capacity, and residential amenities—is attractive. But the publicly available pattern of owner complaints points to substantial risks: water intrusion, slide malfunctions, electrical missteps, weight/handling concerns, and prolonged service delays with warranty ping-pong. Some units and owners fare better, particularly when pre-delivery defects are caught and remedied. However, based on aggregated consumer reporting and the recurrence of serious issues, shoppers should proceed with extraordinary caution, invest heavily in pre-purchase inspection and testing, and negotiate hard on service commitments and pricing.

Given the weight of documented complaints and risk of costly downtime, we do not recommend the Magnitude Super C without rigorous third-party inspection and strong, written service assurances. Many shoppers should consider alternative brands or models with more consistent build-quality records and responsive after-sale support.

Have you owned or tested a Magnitude recently? Post your real-world experience so others can benefit.