I learned about distance from rear axle to hitch the hard way. Well, almost... I have a kubota tractor with loader and also a set of rear forks on the 3 pt hitch. I drilled the front bucket for a VERY handy trailer ball. I have various trailers here and it's awesome to come under the ball, pick up the load of wood and back it over to the planer etc. Then for better visibility while hitching, I made a removeable receiver hitch for the end of the rear forks. All went well at first, but turning a corner on my hilly terrain, while towing my 15' travel trailer downhill, there was so much leverage, it just kept twisting the tractor around and got me jacknifed and one rear wheel up off the groung, before coming to rest. It's a 26 hp diesel 4wd tractor and will pull just about anything, but that rear overhang will get you into trouble quickly. I did however, tow that 15 footer for a month long family vacation behind my '79 fj55 in the mid 90's. I will never, ever forget coming down a switchbacked ridge leading into Death Valley feeling all the while that the pig was trying it's darndest to push us to our death, and run us off the cliff. I have avoided all mountain roads since that day if at all possible. OK, lunch over, back to work.