Just fitted an alleycat tag-along onto my 29er and there appears to be very little clearance between the towing arm and rear wheel wherever I run the clamp. The most clearance was with it jammed up the top of the post (which I’m not keen on for the forces it can generate) and even then a speed bump sized obstacle could cause issues.

Has anyone come across any decent options that work on bigger wheels?

Used a regular trailgator on my Inbred, with an old clunker.

Trek mountain train 201 or 206. Got one to go with my Trek Sawyer 29er and not had any issues. The little un loves it, but now he has got a proper bike, its getting used less, so will probably have to sell it soon.

Follow me. Awesome but expensive.