What makes a 'Motor Caravan'?
For a vehicle to qualify as a 'Motor Caravan' in the UK in the eyes of the DVLA the following permanent fixtures must be present:

Sleeping Accommodation

There must be a bed with a minimum length of 6ft or 180cms

The bed must be an integral part of the vehicle living accommodation area

The bed must be permanent or converted from seats (the bed can fold away during the day)

The bed fixtures must be secured directly to the vehicle floor and/or side walls, unless it is over the drivers cab compartment.

Door

There must be a horizontal sliding door or an outward opening rear or side door.

Seats and Tables

There must be a seating area for diners to sit around

The table can be fixed or detachable

The table must mount directly to the vehicle floor or side walls

The table mounting must be secured as a permanent feature, either bolted screwed or welded. The table itself can be detachable.

Seats must be secured directly to the vehicle floor and/or side walls

The seats must be secured as a permanent fixture, either bolted, riveted, screwed or welded

Permanently secured seating must be available for use at a table

Water Container
Note: DVLA do not state any requirements regarding water storage. However, most
insurance companies state that the water tank should be onboard, or under the chassis. However, some
insurance companies are happy with an external water container that can be moved, such as those used with a caravan. This type of vehicle would not be allowed to use some Aire facilities.

The vehicle must have an onboard or external (e,g, under the chassis) waste water container, the water container to hold 6 gallons/27 litres

Storage

The vehicle must have at least one cupboard, locker or wardrobe

The cupboard must be an integral part of the living accommodation area

The cupboard must be a permanent feature, either bolted, riveted, screwed or welded

The cupboard must be secured directly to the vehicle floor and / or side walls

Cooking

The vehicle must have cooking facilities powered by fixed gas, electric hob or microwave oven

The cooking facilities must be secured directly to the vehicle floor or side wall

The cooking facilities must be a permanent feature, either bolted, riveted, screwed or welded

Gas and electric hobs must have a minimum or 2 cooking rings. Microwave ovens must have a power source (don't just fit one that can't be used)

Gas cooking facilities with remote fuel supplies must have the gas supply pipe permanently secured to the vehicle structure

Outside

The vehicle must have at least one side window

New! Since 2011 the DVLA are now asking that the vehicle look like a motor caravan from the outside. This is a reasonableness test. If it looks like a motor Caravan to a reasonable person or a Police officer, when on the road, then it can be registered as such.