Do they fall out the bottom if the trailer is raised enough? If so, try swapping them to see if the problem switches sides. If so, the fix is pretty easy in that you just need a new part. If the upper part is bent it gets more complicated, of course. I've had this happen on a couple 5th wheels before. Even my brand new Keystone Hideout had this at the time of delivery. At the PDI I noticed it and luckily they just swapped the lower part with another unit on their lot and everything has worked great since. I suspect they are made so that the lower part will bend/fail first since it's easiest to replace. Of course, that is applying logic which often times escapes RV manufacturing so maybe it's just luck.