What Is a Super C RV? Chassis, Brands and Fuel Security

What Is a Super C RV?

A Super C RV (also called a Super C motorhome) is a motorhome built on a heavy-duty commercial truck chassis instead of the lighter cutaway van chassis used on a standard Class C. You still get the familiar cab-over bunk or storage area and a truck-style cab, but underneath is the frame, engine and brakes of a medium-duty work truck.

That makes a Super C a middle ground: easier to drive and park than many Class A diesel pushers, but with far more power, towing capacity and cargo capacity than a regular Class C.

Common Super C Chassis

Super C motorhomes are built on several commercial chassis. Knowing yours matters, because it decides your engine, your towing rating and where your fuel fill sits.

See the Freightliner S2RV and Ram 5500 guide and the Chevrolet and GMC chassis guide for model-by-model details.

Super C vs. Class C vs. Class A

If you are comparing a standard Class C, start with our Ford E-350 and E-450 Class C guide. For gas Class A coaches, see the Ford F53 and Workhorse guide.

Popular Super C Motorhome Brands

Dynamax Super C

Dynamax is one of the best-known Super C builders, with the Isata 5, Isata 6, Force HD and DX3. See Dynamax locking fuel doors.

Entegra Super C

Entegra Coach builds the Accolade XL and Esteem XL Super C models. See Entegra Coach locking fuel doors.

Jayco Super C

The Jayco Seneca is Jayco's Super C, offered on Ford and Freightliner chassis. See the Jayco Seneca locking fuel door.

Other Super C Builders

You will also find Super C models from Thor (Four Winds and Chateau Super C), Holiday Rambler (Incline), East to West (Bravado) and Nexus. Use Find My Fit to check your exact year, model and floorplan.

The Problem: Exposed Fuel Fills

Commercial truck chassis were designed for fleet refueling, not overnight parking at campgrounds. On most Super C motorhomes the diesel or gas fill, and the DEF fill on diesels, sits behind a basic fuel door with no lock, or is open on the side of the chassis.

That leaves your fuel exposed to:

A locking gas cap helps, but it only covers one fill and can still be pried off. Compare the options in locking gas cap vs. locking fuel door.

The Fix: The RV Fuel Vault™

The RV Fuel Vault™ is a locking, theft-resistant steel fuel door made for motorhomes, including Super C models. It covers the fill area, locks with a key and installs with security screws that are included with the door.

See the Super C motorhome fuel cap cover page, or go straight to Find My Fit to see the exact door for your Super C.

Frequently Asked Questions

What is a Super C RV?

A Super C RV is a motorhome built on a heavy-duty commercial truck chassis, such as the Ford F-550 or F-600, Freightliner S2RV, Ram 5500 or a Chevrolet/GMC medium-duty chassis. It keeps the cab-over look of a Class C but adds more power, more towing capacity and more cargo capacity.

What is the difference between a Class C and a Super C motorhome?

A standard Class C is usually built on a Ford E-350 or E-450 cutaway van chassis or a Chevrolet 3500/4500 chassis. A Super C uses a larger commercial truck chassis, most often with a diesel engine, so it can carry and tow much more.

Who makes Super C motorhomes?

Popular Super C models include the Dynamax Isata 5, Isata 6, Force HD and DX3, the Entegra Accolade XL and Esteem XL, the Jayco Seneca, the Thor Four Winds and Chateau Super C models, the Holiday Rambler Incline, the East to West Bravado and the Nexus Super C coaches.

Are Super C fuel caps exposed?

On most Super C motorhomes the diesel or gas fill and, on diesels, the DEF fill sit behind a simple fuel door or open on the side of the chassis, with no lock. Anyone can open them at a campground, storage lot or rest stop.

How do I protect the fuel fill on a Super C RV?

The RV Fuel Vault replaces the exposed fill area with a locking, theft-resistant steel fuel door that helps stop fuel theft, siphoning and tampering. Use Find My Fit to see the exact door for your year, make, model and chassis.