Often discussed. When I researched it I came up with 3 options, all require welding.
1) Weld a frame to frame receiver on the rear of your TT.
2) Cut off and repalce the factory bumber with a heavy guage steel version that is fully welded and supported to the TT frame
3) Take you chances with the thin guage steel bumper, but have additonal support welded between it and the frame and ensure the current welds aren't just tack welded.
I went with #1, found a local shop that maked cusotmer receivers for TT. Cost me $275