M400 Pushback / Tow Tractor B737 & A320 range.

Model M400 tractor has 25,000 to 48,000 lbs. DBP rating—most powerful tractor in the NMC-WOLLARD product line. Model M400 features 4WD, 4 wheel steer, dual planetary reduction drive axles, Cummins 6.7 liter turbocharged diesel and a rugged 6-speed Power... http://www.nmc-wollard.com/products/military-equipment