I haven't done anything yet, but the guys at TakeIt2TheTrack who I bought mine from do it themselves.
They take a small strip of steel, and weld on nuts for eye bolts. This bracket is then bolted to the trailer floor.
The eye bolts are then used to secure the Baxley in the trailer.
I think I'm just going to hard mount mine though. I have no need for it in the garage or pits.