Abstract: Disclosed is a tractor trailer construction wherein the trailer has a pair of spaced side trusses each having an upper beam and a depending support for carrying a load. Telescoping connections under the control of fluid actuated cylinders are located between the trusses at opposite ends of the trailer whereby the trusses can be moved toward and away from one another for loading and unloading. The tractor is releasably coupled to the connection at the forward end of the trailer and a rear axle unit underlies the opposite rear end of the trailer. To load the trailer, dollies are provided to support the front end of the trailer and the tractor and connection between the trusses at the front end of the trailer are removed leaving the trailer open-ended. The trailer is then moved to straddle the load with the trusses lying on opposite sides of the load. The tractor is then reconnected, and the dollies are removed. The trusses are moved toward one another and are raised to engage and support the load.