Look at the IMI swivelling wheel. It is well designed, substantial, suspended, shock absorbed longitudinally, and has a larger wheel than SoaringXX one. Also it uses the same cuff and wheel as their original so I, for example, only had to buy the new arm to upgrade.

The IMI cuff is universal and multi adjustable but its clever trick is the reinforcing contouring of the top sleeve which allows the rear of the top to flex around the top of the wing contour and to grip it. Combined with the new swivelling wheel it is excellent.

I have no connection to IMI but use all their tow out gear, including their rubber block suspension tail dolly. Their own website is not up to date but for you in the USA I see that Wings and Wheels listing is.