TM9-2320-361-10 1-23. TRACTOR TRUCK, WO/W AND W/W: M275A2 a. Purpose of the Vehicle. The M275A2 tractor truck is equipped with a fifth wheel for hauling a semitrailer. When connected to a semitrailer, the fifth wheel pivots up, down, and sideways to allow for changes in terrain. b. Special limitations. Fifth wheel cannot pivot more than 21 degrees up, 15 degrees down, or 7 degrees sideways. For this reason, semitrailer operations cross-country are limited to easy grades over known terrain. TRACTOR TRUCK (M275A2) 1-24. DUMP TRUCK, WO/W AND W/W: M342A2 Purpose of the Vehicle. The M342A2 dump truck is used to transport materials such as sand, gravel, and stone. It may also haul scrap, rubble, or other waste products. The foreward end of the welded steel body extends up and over the cab to protect it from damage during loading, operations. Troop seats may be installed for troop transport operations. DUMP TRUCK (M342A2) 1-11