1991: Volvo integral sleeper
March 2, 2011 | by: John Baxter
Rather than bolting a separate structure made elsewhere to the back of an existing cab design, Volvo introduced in 1991 a cab and sleeper manufactured as a single unit in the same facility. While it was no longer possible to later remove the sleeper and convert the tractor to a day cab, the unit solved air and water leakage problems due to the complex seals required for separate units. The design also reduced weight, increased structural strength and provided a much wider opening to the sleeper, making it much easier for the driver to move from the cab to the sleeper.