What do the MRO and the MTPLM weights mean?

OK. When caravans are advertised there are two weights which are normally displayed:

MRO = Mass in Running Order 

The MRO of the caravan is stated on the caravan weight plate and is the weight of the Caravan to the manufacturer’s specification. This now includes those items required for the safe and proper functioning of the caravan (e.g. gas cylinder, fresh water and hook up cable).

MTPLM = Maximum Technically Permissible Laden Mass

The MTPLM stated is also detailed on the caravan weight plate (usually mounted close to the entrance door). This weight is the absolute maximum weight that the caravan must not exceed to be legal on the road. It includes the allowances for the user payload – all fluids (water etc) and personal belongings that you may wish to carry (clothes, food etc).