I've read that 3 pt hitch backhoes can be a problem, I guess because of the forces a backhoe would place on them that they are not designed for. My 1969 JD2020 (with 48 loader) I guess therefore needs one supported by an under-tractor frame. Make sense? If so, what model should I shop for? Maybe a JD 7, 8 or 10? Would I have any trouble mounting them on the tractor? Hints on what to look for or avoid?