[95 S_Trucker]

If that is a gmt400 truck(88-98 style), the hitch is only rated for 10,000 pounds. That could contribute to the cracked hitch. The frame is supposed to be flat at the rear. The pics make it look bent.

It looks like overloading to me.

Quality hitches are cheap. I personally like curt manufacturing. But the frame will need straightened first.