WEIGHTY MATTERS
There are many weight related terms used in the Recreational Vehicle (RV) world. Some are specified by manufacturers — either tow vehicle, caravan or motorhome — and some are actual weights. Because there are so many specifications, it’s no wonder buyers and owners are confused. Much rides on understanding and getting RV weight right, because it affects safety and keeps you inside the law when travelling.
AGGREGATE TRAILER MASS (ATM)
A rating figure, this refers to the maximum legal total loaded mass of a trailer, be it box, caravan or fifth wheeler, and is specified by the trailer, chassis or caravan manufacturer (note that it includes the Tow Ball Mass, or TBM). In short it is the weight of the van on a weighbridge, resting on the wheels and jockey wheel. It should be found on a nameplate, usually in the front boot or
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