Make your own , I did for my Auster J1n, I used a electric invalide car, turned the handle bars round and used it in reverse ,cut the seat off and made a attachment to clamp rond the tail wheel, pulled it in and out no probs even on soft grass, the tug I use now is a normal ride on mower " bought off Ebay" with a draw bar on that clamps the tail wheel " and the plus side is you can cut the grass round your hangar doors when you are done
Austerwobbler