Originally Posted by
Cyclaholic
Some trailers are deliberately designed with the wheels splayed out (it's called
camber) it allows for a wider track for better lateral stability and loading on the wheels, among other benefits.
Also some wheelchairs is built like this, especially the ones made for "sports and speed".
I had this problem with my homebuilt trailer. It is a flatbed waterproof plywood one. Wheels is hubs from a wheelchair built into 20" wheels from a childs bike.
This should be strong, but on my first proper attempt to pull the dog (25 kg) in it the "wheelbend thing" happened. Wheels rubbed on the basket I put on it to help the dog stay in place.
I thought maybe I used the wrong axel or something (has got parts from several wheelchairs

) but then I realised it was possible to adjust the lenght of the axei, there is a nut in the end of it.
After adjusting the axel it is just fine, and alot of the "ratteling noice" is gone.