I have owned a converted tractor, and helped spec out trucks for others. There are lots of converted dumps in this area.
Most trucks have a strong enough frame. Peterbilt is the one frame that usually is NOT strong enough, and will need to be doubled.
International and KW usually have a very good frame for using as a dump.
A lot of the dump bodies have a mini-frame built into them that attaches to your frame and helps reinforce it.
You do want to look carefully and find a truck with the right engine, trans, and rear ratio. The suspension is important also. If it is very hilly where you are then you may not want to use an air ride, or convert it to where there is an air suspension ride height valve on each side of the axle to keep the lean factor down.
Another good idea is to have bump stops between the frame and axles, then drop the air suspension when dumping to keep the tip-over factor down.
Ox Bodies in S.C. will tell you if your frame is strong enough if you give them a call. They do this conversion every day, and know a lot about what they are doing.
If you strip your frame and get ready for the conversion yourself, you can drive down there in the morning and leave with a new dump body that evening. Darn good bodies too.
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