nice pic!here is a michigan gravel train
here is a "B" train. the lead trailer has a fith wheel plate on the back. "A" trains have a pintle that a dolly hooks to. Most of the gravel trains are A style. Some grain haulers have B style. or if they belly unload they use B style
Michigan has a 162000lb weight limit. Most states have 80,000lb. This tears up the roads bad. If they lowered the limit we would spend less money on road repair and have more jobs (need more trucks)