Trailers don't share their weight with another vehicle.

There are several ways to classify trailers, by weight, size, or the number of axles, I.e.: Tandem; Tridem; etc.

Another way is by the type of cargo area, I.e.: high boy; tanker; van; etc.

And of course there is no end to the combinations of those two methods, i.e.: Tandem Tanker; Tridem Van; Etc.;

Here are just a few examples:

DUMP or GRAVEL A true trailer, the front axle is permanently attached.	TRANSFER The box from this trailer can be transfered into the box on the truck.

POLE Equipped with a logging bunk. The axle unit can be moved back or forth on the pole, or reach, to accommodate various lengths of cargo, poles, beams, logs, etc.	PONY Equipped with a dump box for gravel.