bolts on wheel house

[arcticcat400]

i have a 16' wheel house and theres one bolt that holds the wheel assembly on its bolted through a piece of tubing that holds my leaf spring in place then bolted through the frame and the bolt has 2 nuts on it but it still seems to come loose easily then my wheels tip in but when there tight the house sits fine so i was thinking either weld the nuts together and maybe to the frame? of drill out the bolt and nut and put a pin through it? any help on how to fix this is greatly appreciated

[theoilman]

Normally when you have double nuts their purpose is to lock each other without the first having to be tightened down. If vibration is causing them to loosen up, I would recommend remove both nuts, clean thoroughly (I would use a brake-cleaner product), then reinstall both nuts in their proper position using blue thread locker on the threads of the bolt. Don't use the red thread locker!

[Flip37]

Use lock nuts.