The HF Trailer Hitch/Dolly connection with 2 wheels to move a light trailer (apx 500 pounds total or less) is OK at best on grass. On a hard level surface, a weight up to 1-2000 pounds may also be OK. I use it for my small outboard (dingy)
For a TT weighing 4-6,000 pounds, I would opt for a powered dolly. I opted for the following (Model AC-10
) - I have no affiliation with the individual or company, but tell him someone from the forum mentioned it and I am sure he could work out a forum deal for you/all in the forum. He CUSTOM makes all sizes 1 at a time specifically for the individual customer's needs/requirements. I will be getting mine in a few weeks after I pick up my new TT.