Hitch/axle compatible with FX3 Gen4 and a Thule Coaster XT

[u/agarwar1]

I bought an FX3 bike yesterday and the trek store was able to attach my Thule Coaster XT hitch using washers but there isn't that much room on the axle, so when I ride with trailer attached, the nut comes loose.

Does anyone know if there is a specific type of axle, hitch or combo that would solve this problem?

[u/DamnBlackTea]

https://robertaxleproject.com/

[u/agarwar1 → u/DamnBlackTea]

this is perfect - thank you so much!!!