boomer one of my thoughts was that you want to put a box on behind the cab, ok you know how long you want the box, next see what t6he available used trucks have in general as far as tandems and the cab to center of tandems (lets call that cot) is then compare box versus cot. you'll then know if the box will need to extend past the cot. ok, most of toe trucks i looked at on truck trader were carring 24 to 28' beds. if your desired box fitscool or then if it diddn't ok check the ball load added to the swag of the box load . most of the adds had a rear capacity given. plus and minus tells you if you are ok. i'm sure ther are more sofisticated/sp, but that ought to get you in the ball park. oh, the fact that you'll have a box/bays(storage) and a trailer is the why i' put the tandems under your rig. given the cost(used) of the extra axle and the capacity, puls the stabilit if there's a 30-50 mph cross wind i thought it might be worth consideration anyhow. mase
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