The kit includes : An extra long quick release pin and a hitch bracket.
The product size is as follows according to the part number: 22,86 x 7,62 x 5,08 cm (9 X 3.6 X 2 inches).
If you have a hub gear, these are possible:
Thule adapter Shimano Nexus/Alfine hub gears
Otherwise post a picture of the rear wheel.
I just realised that not even all MTB frames are suitable for trailers...
Greetings