What motorhomes does the RV Fuel Vault fit?

The RV Fuel Vault fits all Super C motorhomes built on Ford F-550 and F-600 chassis platforms, including Entegra Coach Accolade XT & Esteem XL, Jayco Seneca XT, Grand Design Lineage Series F, Dynamax Isata 6, Holiday Rambler Incline FS600D, East to West RV Bravado, Fleetwood RV Altitude 600D, and Thor Four Winds Chateau Diesel (Super C F550). It works with any motorhome that uses the standard Ford F-550/F-600 exposed fuel cap configuration.

Why do Super C motorhomes have exposed fuel caps?

Super C motorhomes are built on commercial Ford F-550 and F-600 truck chassis, which were designed for commercial applications where fuel cap security wasn't a priority. When RV manufacturers build motorhomes on these chassis, the diesel fuel caps remain exposed and unprotected on the exterior of the vehicle — making them vulnerable to theft, siphoning, contamination, and vandalism. The RV Fuel Vault was invented specifically to solve this problem.

How much does the RV Fuel Vault cost?

The RV Fuel Vault retails at $199.95 for a complete set of 2 security fuel cap covers (one for each side of your motorhome). Pre-order now for just $149.95 and save $50! Free shipping is included in the Continental United States. All other locations ship at an additional cost. The product comes with a 24-month manufacturer warranty.

Is the RV Fuel Vault easy to install?

Yes! The RV Fuel Vault features a simple bolt-on installation that requires zero modifications to your motorhome. Using only basic hand tools (wrench or socket set), most owners complete the install in 8–15 minutes. Detailed instructions with photos are included, plus a step-by-step video guide is available at rvfuelvault.com/installation.

What warranty does the RV Fuel Vault come with?

Every RV Fuel Vault set comes with a 24-month manufacturer warranty covering defects in materials and workmanship. If anything goes wrong within the warranty period, we'll replace it at no cost to you.

Does the RV Fuel Vault prevent fuel siphoning?

Yes. The RV Fuel Vault completely covers and locks over your fuel caps, making it physically impossible to insert a siphon hose or tamper with the fuel cap. The tamper-resistant keyed lock design provides full anti-siphon protection for your diesel fuel — giving you peace of mind at campgrounds, truck stops, and overnight parking.

What is the best diesel fuel cap cover for an RV?

The RV Fuel Vault is the first and only diesel fuel cap cover designed specifically for RV motorhomes built on the Ford F-550 and F-600 Super C chassis. Unlike generic aftermarket caps, this purpose-built diesel fuel cap cover for RV use features a heavy-duty steel construction, tamper-resistant keyed lock, and bolt-on installation with zero modifications. It is patent pending (19/632,042), made in the USA, and comes with a 24-month warranty.

Can I still fuel my RV with the RV Fuel Vault installed?

Absolutely. Simply unlock the cover with your key, lift it open, and fuel as normal. The cover stays attached to your RV at all times — no parts to lose or misplace at the fuel station. Lock it back up when you're done and you're back on the road.

Is the RV Fuel Vault made in the USA?

Yes! The RV Fuel Vault is proudly designed and manufactured in the United States. We're a family-owned business of RV enthusiasts who created this product because we personally experienced the vulnerability of exposed fuel caps on our own Super C motorhomes.

Is the RV Fuel Vault patented?

The RV Fuel Vault is Patent Pending under U.S. Patent Application 19/632,042. It is the first product of its kind — specifically engineered to protect the exposed diesel fuel caps found on Ford F-550 and F-600 Super C motorhome chassis.

Can RV dealers or manufacturers become distributors?

Yes! We welcome partnerships with RV dealers, service centers, and manufacturers. The RV Fuel Vault is an excellent aftermarket add-on or factory option for Super C motorhomes. Contact us at 1-941-393-1493 or through our website to discuss dealer pricing and OEM partnership opportunities.

How does the RV Fuel Vault protect against fuel contamination?

The RV Fuel Vault creates a sealed, locked barrier over your fuel cap, preventing anyone from introducing water, sugar, dirt, or other contaminants into your diesel fuel system. Even a small amount of contamination can cause thousands of dollars in engine damage — the Fuel Vault eliminates this risk entirely.

Is the RV Fuel Vault the same as a fuel tank hatch or fuel neck cover?

The RV Fuel Vault serves a similar purpose to fuel tank hatches and fuel neck covers but is purpose-built specifically for Ford F-550 and F-600 Super C motorhomes. Unlike generic fuel tank hatch covers or universal fuel neck covers sold at RV parts retailers, The RV Fuel Vault is precision-engineered to fit the unique exposed dual diesel fuel cap configuration found on Super C chassis. It combines the security of a locking fuel door with the heavy-duty protection that motorhome owners need.

How does the RV Fuel Vault compare to chrome fuel doors or aftermarket fuel door covers?

Chrome fuel doors and generic fuel door covers are typically designed for trucks and cars — not for the exposed dual diesel fuel caps on Super C motorhomes. The RV Fuel Vault is the first product specifically engineered for this application. It features heavy-duty steel construction (not decorative chrome), a tamper-resistant keyed lock, and a bolt-on design that requires zero modifications. It provides real security against fuel theft and siphoning, unlike cosmetic fuel filler doors.

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Super C Motorhome Buyer’s Guide: Choosing the Right Ford F-550/F-600 Model

12 min readMarch 2026

Why Choose a Super C Motorhome?

Super C motorhomes combine the power and towing capacity of a commercial truck chassis with the luxury and livability of a Class A motorhome. Built on the Ford F-550 or F-600 chassis with the proven 6.7L Power Stroke diesel engine, these coaches offer:

Towing capacity up to 20,000+ lbs (tow a car, boat, or trailer)

Commercial-grade drivetrain designed for heavy loads

Better maneuverability than Class A coaches of similar length

Superior ride quality vs. Class C on lighter chassis

The Manufacturers

Entegra Coach — Accolade XT & Esteem XL

Entegra, owned by Thor Industries, is the premium choice in the Super C segment. The Accolade XT features full-body paint, residential appliances, and luxury finishes throughout. The Esteem XL offers similar quality at a more accessible price point.

Price range: $280,000–$450,000+

Jayco — Seneca XT

Jayco’s Seneca XT is a well-rounded option that balances features with value. Known for their JRide suspension system and industry-leading 2-year warranty.

Price range: $250,000–$350,000

Grand Design — Lineage Series F

Grand Design’s entry into the motorized segment, the Lineage Series F, brings their reputation for quality construction and innovative floor plans to the Super C market.

Price range: $300,000–$400,000+

Dynamax — Isata 6

Dynamax specializes in Super C motorhomes and the Isata 6 is their flagship. Multiple floor plans offer flexibility from couples’ coaches to family-friendly layouts.

Price range: $250,000–$380,000

Thor Motor Coach — Four Winds Chateau Diesel

Thor’s Four Winds Chateau Diesel (Super C F550) offers strong value with Thor’s extensive dealer network and parts availability.

Price range: $220,000–$320,000

Holiday Rambler — Incline FS600D

The Incline FS600D from Holiday Rambler targets the premium end with refined interiors and the F-600 chassis for extra payload capacity.

East to West RV — Bravado

A newer entry from East to West RV, the Bravado is gaining attention for its modern design and competitive pricing.

Fleetwood RV — Altitude 600D

Fleetwood’s Altitude 600D leverages decades of motorhome experience with a focus on full-time livability.

The One Thing They All Have in Common

Regardless of which manufacturer you choose, every Super C motorhome built on the Ford F-550 or F-600 chassis shares the same vulnerability: exposed, unprotected diesel fuel caps.

This is a Ford chassis design characteristic, not a manufacturer oversight. The fuel filler necks on these commercial chassis were designed for fleet refueling, not for overnight camping at campgrounds where security matters.

The RV Fuel Vault™ is the first and only product purpose-built to solve this problem — and it fits every Super C model listed above.

Check compatibility → | Pre-order →

Super C motorhome comparisonFord F550 motorhomeFord F600 RVEntegra Accolade vs Jayco Senecabest Super C motorhome 2026

Ready to Protect Your Fuel System?

The RV Fuel Vault\u2122 \u2014 the first security fuel cap cover for Super C motorhomes.

Pre-Order Now \u2014 $149.95