Own a Nexus RV?
“Lock Your Fuel Doors.”
The RV Fuel Vault is the only purpose-built locking fuel door for RVs — engineered to fit Nexus Super C and Class C motorhomes.
Use code NEXUS and save $10 per door
Why Nexus RV Owners Swear By It
Your Nexus RV is a serious investment — but that exposed diesel or gas fuel cap on the chassis is left wide open. The RV Fuel Vault is the simple upgrade that finally puts that worry to rest.
Fuel Theft Protection
A tamper-resistant keyed lock stops siphoning and vandalism. No more worrying about your fuel at campgrounds, truck stops, or storage.
Contamination Defense
Seals your filler neck and DEF cap against water, road grime, sugar, and cross-fills that cause expensive repairs.
Factory-Finished Look
Replaces the ugly exposed fuel cap with a clean, armored finish worthy of your rig. The part the factory forgot.
8–15 Minute Install
No drilling, no cutting, no body mods. Bolts on over your existing filler neck with basic hand tools.
Lifetime Warranty
High-strength UV-resistant polymer built to last. Backed by a Limited Lifetime Warranty. Made in the USA.
Free Shipping
Free standard shipping on every order. One key opens the fuel door, passenger-side door, and DEF cover.
See the Difference
This is what most Nexus RV rigs roll off the lot with: an exposed, unprotected fuel cap. The RV Fuel Vault changes that.
❌ Before — Exposed & Vulnerable
✅ After — Locked & Protected
Built for Your Nexus RV — and Every RV You Own
Engineered to fit Nexus Super C and Class C motorhomes, the RV Fuel Vault also fits every other major RV type. Use the fitment finder to confirm your exact model.
Super C Motorhomes
Ram 5500, Ford F-550/F-600 & more
Class A Motorhomes
Ford F53, Workhorse chassis & more
Class C Motorhomes
Ford E-350/E-450, Sprinter & more
Class B Campervans
Ram ProMaster, Ford Transit & more
Toy Haulers
Fuel cap protection for your hauler
Fifth Wheels & Trailers
Protect the truck that tows your rig
Nexus RV Discount: $10 Off Per Door
Use code NEXUS at checkout — or just order through this page and it's applied automatically.
Free shipping • 30-day satisfaction guarantee • Limited Lifetime Warranty
From one RV owner to another:
“I added these to my own rig and honestly wish they came standard. That exposed fuel cap always bugged me — it's a security risk, a contamination risk, and it looks unfinished. The RV Fuel Vault fixed all three in about ten minutes. If you camp, travel, or store your RV like I do, do yourself a favor and get one.”
— A fellow RV owner & RV Fuel Vault partner