Peterbilt has partnered with London Machinery to offer customers a complete truck and body for delivery through Peterbilt dealers. The Integrated Mixer Program includes several mixer sizes installed on most Peterbilt truck chassis. Drum sizes (in yards) are 8.5, 9, 9.5, 10.5 and 11, and standard, high performance and bridge-span models can be ordered. London installs the mixer bodies at several locations in the U.S. and Canada. Models 320, 335, 357, 378, 379 and 385 can be ordered in the program.