I regularly put that amount of stone in my LoadTrail 14x7 dump trailer - which weighs 4370# emply. Yes, that puts me about 1.5k over the GVWR. I tow for about 20 minutes with that load, up a 7.5% grade for about 2 miles with a dually RAM. I would never try that with an aluminum trailer. The...
That mounting of a backhoe indeed looks cumbersome. All TLBs are NOT created equal, however, as stated by someone earlier... I did have some trouble getting my TLB up on a trailer for transport, but I was loading onto a dump trailer w/a 30" high deck and 7' ramps... could not drive forward...