One of the more popular chassis options, Ford, provides a chassis for every style of ambulance. For the type I, you have the option of an F550 and F450, available in both long and short wheel bases with a 4×4 option, and the F350 short wheel base with a 4×4 option. The Ford Transit, available as a type II, comes with many chassis options. T-350, T-250, Gas, Diesel, Mid Roof, High Roof, the choice is yours. The E450, another popular type III chassis, can also support the same modular box size as a long wheel base type I. The E350 with a smaller modular box is another option. If a medium duty ambulance is what you want, the F650 chassis is what you are looking for.