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Thumb of Michigan | A Michigan special is typically going to be pretty heavy. Any way you'd consider a 4 axle rather than a 3 axle? Or: if you have room, you could stay with a tri ax and put the 3rd axle as a 9' spread. If you can. I like Michigan specials, its all I'd consider for a straight truck especially, but the tare weight on a straight truck can get you if you're short of axles.
Last tri axle we had had a 20' Thumb truck box. Can't remember the wheelbase now. We had Bud put the sides on inside out, so it was a wider than normal box at that time. Seems like is was 72" sides with the sideboards, and it was very easy to overload.
We had a 4 axle with a 24' Bender box. Bought it used from Dorothy Leddy. Worked good, it was easy to overload as well. Had a little more box behind the last axle than we maybe would have preferred, but we made it work for a lot of years.
A call to Darryl @ Thumb Truck with the pertinent measurements (WB, Cab to center of drives, frame length behind cab, etc) would be the first thing I'd do.
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Wheel base of a tri axle straight truck
