"It is best to attach the trailer to your bike frame or seatpost but please do not attach it to the axle."
I had the same issue and contacted rad for options. THEY RECOMMENDED TO NOT ATTACH A TRAILER TO THE REAR WHEEL. Here is the response I got:
"Please do not attach a trailer to your rear axle. We do not recommend attaching anything to your rear axle and we do not offer any other nut aside from the stock one that you already have. Attaching a trailer to your rear wheel axle can damage the motor and possibly cause an accident because the rear axle is not designed to hold trailers. The good news is that your RadRunner has plenty of other areas where you may attach a trailer for your doggie. As I mentioned in my email please look into some of the Rad Owners Groups online where you may find some tips on attaching a trailer to your Runner. It is best to attach the trailer to your bike frame or seatpost but please do not attach it to the axle."
I had the same issue and contacted rad for options. THEY RECOMMENDED TO NOT ATTACH A TRAILER TO THE REAR WHEEL. Here is the response I got:
"Please do not attach a trailer to your rear axle. We do not recommend attaching anything to your rear axle and we do not offer any other nut aside from the stock one that you already have. Attaching a trailer to your rear wheel axle can damage the motor and possibly cause an accident because the rear axle is not designed to hold trailers. The good news is that your RadRunner has plenty of other areas where you may attach a trailer for your doggie. As I mentioned in my email please look into some of the Rad Owners Groups online where you may find some tips on attaching a trailer to your Runner. It is best to attach the trailer to your bike frame or seatpost but please do not attach it to the axle."
