[jack65]

Originally Posted by madmaxmutt

The bed should be out when you try the screws, not in. There should not be downward weight on the innermost portion of the rails when you remove the screws.
With the jack holding it firmly at the top, there should be no downward pressure at all...

Based solely on the pictures you posted before, I would do the washers. It appears the bending of the rails has begun on your trailer.
How can that be if the screws are so tight? I does appear to be a gap at that end on the right side.

I can only venture a guess on the other parts. I would not want anything that is not purely stable under it while moving. I know both of my slides moved smoothly when operating properly. No side to side movement that I have ever noticed.
It was definitely moving side to side some when pulling it out. With my wife inside supporting it, it went a lot smoother. I wonder if there is another problem there? I will have to check when I get back from vacation. I'm out of time.
They do tend to droop a little near the end of the run out, and snug back up at the very end.

When I get back from vacation, I'll get my brother in law to help me see what is going on. We have to fix the front where the delamination bubbles are at the same time. Too many issue on this trailer. I'm going to fix it and sell it. New trailer next time and I will read every review online, especially here on this forum. The last two pics show the trailer at it's worse two weeks ago, somewhat better now? Have no idea why as the weather has been the same.