RV Diesel Theft Is Skyrocketing — Here's What You Can Do About It

6 min readJune 2026

RV Diesel Theft Is Skyrocketing — Here's What You Can Do About It

Diesel motorhomes are the #1 target for fuel theft because they carry the most fuel with the least protection. A typical Super C on a Ford F-550 or F-600 chassis carries 50–80 gallons of diesel per side — that's $250–$400+ per tank at current prices. Both fuel caps are completely exposed on the chassis rail.

Why Diesel RVs Are Prime Targets

Massive tanks: 50–100+ gallons of diesel worth $250–$500+

Dual exposed caps: Super C motorhomes have fuel caps on BOTH sides

DEF caps too: The blue DEF cap is also unprotected

Parked overnight: Campgrounds, Walmart lots, rest areas

The Real Cost of Diesel Theft

$250–$500 in fuel per incident

$1,500–$2,500 for fuel tank repairs if thieves drill the tank

$8,000–$20,000 for engine/emissions damage from contaminated DEF

How to Protect Your Diesel RV

Step 1: Lock down your fuel ports. The RV Fuel Vault covers both diesel AND DEF caps under tamper-resistant keyed locks.

Step 2: Park smart. Position your fuel caps against walls or other vehicles.

Step 3: Stay informed. Join Super C owner groups that share theft alerts.

The RV Fuel Vault for Diesel Motorhomes

Covers both diesel fuel cap AND DEF cap (3-Pack option)

Same key opens both sides

Bolt-on in 8–15 minutes per side

Pricing: Single Door: $139.95 | Set of 2: $279.95 | 3-Pack with DEF: $419.95

[Lock down your diesel →](/#pre-order)

*Patent Pending · Made in USA · Limited Lifetime Warranty*

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Ready to Protect Your Fuel System?

The RV Fuel Vault™ — the first locking fuel door purpose-built for Class A, C & Super C motorhomes.

Order Your Founders Edition

Single Door•2-Pack (Most Popular)•3-Pack + DEF•Large Door