GVM 

(Gross Vehicle Mass)

Maximum allowable total mass of a fully loaded motor vehicle, consisting of tare mass plus the load.

GCM 

(Gross Combination Mass)

Is the weight the tow car and trailer must not exceed, this is set by the tow car manufacture.

ATM 

(Aggregate Trailer Mass)

The total laden weight of the trailer. This includes the tow ball mass and whatever you add as payload.

Tare

Tare is the weight of the caravan when it comes off the production line minus water and gas.

TBM

(Tare Ball Mass)

Tare ball mass is the tow ball weight at tare.

Payload

Is the amount of weight allowed in the caravan, ATM - Tare = Payload.

GTM 

(Gross Trailer Mass)

The total permissible mass which includes whatever is added as payload that can then be supported by the wheels of a trailer. It does not include the mass supported by the tow ball.

Chassis Number

Your chassis number is normally made up of letters and numbers and can be found towards the top of your A-Frame.

VIN Number

The VIN is a unique 17 character serial number used to identify a vehicle.

2 Way

A fridge that can run a 2 different power source's eg: 12v,  240v.

240v

240 volt mains power

12v

12 volt battery power

3 Way

A fridge that can run on 3 different power source's; 12v, 240v or Gas. A 3 Way fridge uses ammonia and is an absorption fridge

compressor fridge uses refrigerant gas much like your house fridge.

Hitch

The device on the front of a caravan that attaches to the towball of a car, also referred to as hitch head coupling.