Consider putting in a Watts Like, just like they use on race cars. The travel will be limited. Should be easy to do that will allow the box to move up and down with easy. Put one in front and one in back. Should be easy to fab up with big Heim joints and heavy steel tubing.
Watt's linkage - Wikipedia, the free encyclopedia
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Started looking for 379 Peterbilt TC, 24' to 30' box, bumper pull--but ended up w/1999 Liberty Coach conversion of 45' Prevost XLV bus. 1,000sf heated/AC'd race shop w/dump station, 50amp shore pwr where bus parks, 3 NASCAR/ARCA race cars & 26' Bravo trailer.
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