My 56 tow truck and 57 fire engine will both run 65 mph all day long. The fire engine weighs 14,200 pounds empty. Your 55 with a roll back body and the Jeep on top will weigh about the same. The Airstream might slow things down a bit and you'll slow down on hills, but it can be done. Both trucks have V8 engines (350 sbc in TT and 322 in FE).
Mike B
