Depends on equipment assumeing standard off the shelf semi setup though your going to want a standard 18 wheeler.
Hopper bottom, walking floor or end dump would work for that. Hopper is easiest if your doing a conveyor or pit dump, walking floor is best if you have obstructions overhead but need it in a bin and dont want to push it with a loader, end dump is best at doing a bit of everything else though needs flat ground. Max is going to be 80,000 without special permits most likely unless there is a multi state ag permit i am unaware of which is not unlikely because i dont do a lot of multi state AG work.
Max axle weight is going to depend on the type/length of trailer and truck. 48 foot split axle end dump for example can go 38K on the rears vs 34K for a standard tandem as long as the gap on the split axle is iirc 8 foot between the axles. Truck is always going to be 12500 (many say 12 just to avoid issues) on the steer axle and 34K on the truck tandems unless you get into pushers or tri axle trucks which are unnessesary unless your going to do a lot of overweight loads and just subtract from your overall payload if your going to do 80k or even 85500 where permitable with a split axle.















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