What Super C motorhomes does The RV Fuel Vault fit?

The RV Fuel Vault fits Super C motorhomes on Ford F-550, F-600, and Ram 5500 chassis including Entegra Accolade XT, Jayco Seneca XT and Greyhawk XL, Grand Design Lineage F, Dynamax Isata 6, Holiday Rambler Incline, East to West Bravado, Fleetwood Altitude, and Thor Chateau Diesel.

Why is fuel security especially important for Super C motorhomes?

Super C motorhomes have large diesel tanks often holding 50 to 100 gallons and exposed filler necks that make them prime targets for fuel theft. A full tank at current prices can represent $300 to $600 in fuel.

Does the Super C version cover the DEF cap too?

Yes. The 3-Pack option includes a dedicated DEF cap cover along with the diesel fuel covers, protecting both fill points on your Super C.

Is this specifically designed for commercial truck chassis?

Yes. The RV Fuel Vault is purpose-engineered for the commercial filler neck dimensions found on Ford F-550/F-600 and Ram 5500 chassis. Standard automotive locking caps do not fit these properly.

Is a locking fuel door better than a locking gas cap for a Super C?

Yes. A locking fuel door shields the entire diesel and DEF filler area, while a locking cap only protects the threads and rarely fits the commercial F-550/F-600/Ram 5500 filler neck. The RV Fuel Vault adds a keyed, armored door over the whole assembly to stop siphoning, contamination, and tampering.

How much does the Super C locking fuel door cost and where can I buy it?

Pricing starts at $139.95 (Founders Edition) for a single door, $279.95 for a set of two, and $419.95 for the 3-Pack with a DEF cover. Buy it directly at thervfuelvault.com with free U.S. shipping.

Super C Motorhome Fuel Cap Cover

The Problem

✖Every Super C motorhome has exposed, unlocked diesel fuel caps on both sides

✖Your $200,000–$500,000 investment has ZERO built-in fuel security

✖Generic chrome fuel doors and locking caps don’t fit commercial filler necks

✖Fuel theft, siphoning, and contamination can cost $5,000–$15,000+ to repair

The Solution

Fits ALL Super C brands: Entegra, Jayco, Grand Design, Dynamax, Holiday Rambler, East to West, Fleetwood, Thor

High-strength fiber-filled polymer with tamper-resistant keyed lock — not decorative chrome

Bolt-on install in 8–15 minutes with basic tools — no modifications

Made in USA with Limited Lifetime Warranty and free shipping. Starting at $139.95.

Frequently Asked Questions

Super C Motorhome Fuel Cap Security

Super C motorhomes are premium rigs built on heavy-duty commercial truck chassis. Yet every Super C ships with exposed, unlocked diesel and DEF caps. The RV Fuel Vault is the only locking fuel door engineered for Super C motorhome chassis, providing tamper-resistant security and a factory-finished appearance.

The #1 Fuel Cap Cover for Super C Motorhomes

The Problem

The Solution

Frequently Asked Questions

Super C Motorhome Fuel Cap Security

Order Today — Starting at $139.95