air bags
My truck uses two small (4" D x 6" ? tall). It is an old Peterbilt and it pivots at the front of the cab on large bushings. The cab is only about four feet long and the travel is around 1 1/2". Are you going to make the cab and all of the body ride on air? I have seen trucks on the freeway with long sleepers that move with the cab and they have much more travel than mine. Good luck and put some pictures up as you go.
Kenn
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