Every field has its jargon, and RV ownership, travel, and maintenance is worse than most. This glossary covers the 41 terms that come up again and again in our guides and in the questions readers send us. Definitions are short on purpose: enough to unblock you, with links to deeper guides throughout the site when you want the full story.

Awning

A retractable fabric canopy that extends from the side of an RV to provide shade and shelter. Most RVs have electric or manual awnings that can be deployed when parked.

Basement Storage

External storage compartments built into the undercarriage of an RV. These spaces are useful for storing tools, outdoor equipment, and other items you don’t need inside the living area.

Battery (House)

Deep-cycle batteries that power lights, appliances, and systems inside an RV when not plugged into shore power. Most RVs use multiple 12-volt batteries wired together.

Boondocking

Camping in an RV without hookups in remote areas, relying on your own water, power, and waste systems. It’s also called dry camping and requires careful management of resources.

Brake Fluid

The hydraulic fluid that transmits braking force in an RV’s brake system. It needs to be checked regularly and replaced according to manufacturer specifications.

Campground

A designated area where RVs can park temporarily, often with available hookups for water, electricity, and sewage. Campgrounds range from basic to full-service with amenities.

Caulking

Waterproof sealant material used around RV windows, doors, and seams to prevent leaks. Caulk needs regular inspection and reapplication as it degrades over time.

Class A RV

The largest type of motorhome, built on a heavy-duty bus chassis and resembling a large coach. Class A RVs typically offer more space and amenities than smaller classes.

Class B RV

A smaller motorhome built on a van chassis, also called a camper van. Class B RVs are more fuel-efficient and easier to maneuver than larger classes.

Class C RV

A medium-sized motorhome built on a truck chassis with an over-cab bedroom. Class C RVs offer a balance between size, comfort, and maneuverability.

Clearance

The maximum height and width an RV can safely travel without hitting obstacles like bridges or tree branches. Always know your RV’s exact clearance dimensions before traveling new routes.

Converter

An electrical device that converts 120-volt AC power from shore power into 12-volt DC power to run lights and small appliances. Most RVs have a converter to keep the house battery charged.

Delamination

When the layers of an RV’s walls separate, usually caused by water infiltration or material breakdown. This is a serious structural problem that requires professional repair.

Diesel Pusher

A Class A motorhome powered by a diesel engine mounted at the rear. Diesel pushers are more fuel-efficient and durable for long-distance travel than gas-powered RVs.

Dinette

A booth-style dining table with bench seating typically found in RVs. Many dinettes convert into additional sleeping space at night.

Dry Weight

The weight of an RV without passengers, cargo, fuel, or water. This number is important for understanding towing capacity and vehicle weight limits.

Dumping Station

A facility where RV owners can empty their gray and black water tanks. These stations are available at many campgrounds and RV parks.

Electrical Hookup

A shore power connection that provides 120-volt or 240-volt electricity to an RV from an external source. Most RV parks offer 30-amp or 50-amp electrical hookups.

Ext. Battery

See Battery (House).

Freshwater Tank

The onboard tank that stores clean drinking and cooking water in an RV. The size varies by RV model and affects how long you can boondock.

Full Hookup

A campsite that provides water, sewer, and electrical connections to an RV. Full hookups are the most convenient option for camping but typically cost more than partial hookups.

Generator

A device that produces electricity by burning fuel, usually gasoline or diesel, to power RV systems when shore power is unavailable. Most RVs have a built-in generator for emergencies and boondocking.

Gray Water Tank

The tank that holds wastewater from sinks, showers, and washing machines in an RV. Gray water is relatively clean compared to black water and can be discharged at appropriate facilities.

Gross Vehicle Weight Rating

The maximum safe weight an RV can carry including passengers, cargo, fuel, and water. Exceeding this rating is dangerous and may void warranties.

Hookup

Connections for water, electricity, or sewer available at an RV site. Hookups allow you to use RV systems without depleting onboard tanks or batteries.

Insulation

Material inside RV walls that regulates internal temperature and reduces noise. Poor insulation makes it difficult to heat or cool an RV efficiently.

Inverter

An electrical device that converts 12-volt DC power from the house battery into 120-volt AC power. Inverters allow you to run standard appliances when not plugged into shore power.

Leveling Jacks

Hydraulic or electric jacks that extend from the RV frame to level it when parked. Proper leveling is important for safe operation of appliances and comfortable living inside.

Lithium Battery

An advanced battery technology that’s lighter, lasts longer, and charges faster than traditional lead-acid batteries. Lithium batteries cost more upfront but are increasingly popular for boondocking.

Motorhome

An RV with its own engine and driving cabin, as opposed to a towable trailer. Motorhomes are available in Class A, B, and C sizes.

Payload Capacity

The maximum weight of cargo, passengers, and supplies a vehicle can safely carry. Exceeding payload capacity can damage the RV and make it unsafe to operate.

Propane Tank

The container that stores propane gas used for heating, cooking, and powering appliances in an RV. Propane tanks need regular inspection and refilling at appropriate facilities.

Roof Vent

An opening in the RV roof with a fan or cover that provides ventilation and removes moisture. Roof vents help prevent mold and condensation buildup inside the RV.

Rubber Roof

A roof covering made from EPDM rubber, a common material for RV roofs. Rubber roofs require periodic cleaning and sealing to prevent leaks and UV damage.

Shore Power

Electricity supplied from an external source like a campground hookup, as opposed to generator or battery power. Shore power is the most efficient and economical way to run an RV.

Slide-out

A section of the RV that extends outward when parked to increase interior living space. Slide-outs improve comfort but require regular maintenance of seals and mechanisms.

Toilet Flange

The seal and mounting hardware that attaches an RV toilet to the black water tank. A worn flange can cause odors and leaks from the bathroom.

Towing Capacity

The maximum weight a vehicle can safely pull behind it while traveling. Exceeding towing capacity is illegal and dangerous.

Travel Trailer

A towable RV that’s pulled behind a truck or SUV and has its own sleeping and living areas. Travel trailers range from small teardrop models to large multi-slide models.

Ventilation

The movement of fresh air through an RV to remove odors, moisture, and stale air. Good ventilation is important for comfort and preventing mold growth.

Water Heater

An appliance that heats water for showers, sinks, and other RV needs, typically powered by propane or electricity. Most RV water heaters are small and take time to heat water.