Fix for shower door sag
Our shower door started to sag and became difficult to open without having to pull up on the whole door. This happened after only a year on our new 27FB Globetrotter, and we'd had a similar problem on a previous AS. I'd read several other posts on trying to adjust the hinge or raise the whole door but they all sounded rather difficult and after trying to remove the door, I gave up on those solutions. The shower and door frame seemed solid and still square, so I started guessing that he door itself was no longer a rectangle and was becoming a parallelogram.
I was able to still 'lift' the whole door a fraction of an inch so I found some spacers to fit under the outer edge of the door (opposite the hinge) and got the door closed after lifting it. After the next 100 mile drive (not necessarily bumpy) I found the the interference with the frame was less. On the next trip, I was able to increase the height of the spacers and got even more clearance and the door opened freely. The next trip with a slightly larger spacer seemed to have the door back to the original configuration with even clearance across the whole bottom.
It's a little bit of a hassle to remember to position the spacer before each trip, but it's been worth it for us.