I just disposed of my beloved 1990 30E. Very sad. Water got in from the roof and started rusting the frame causing the sides to bulge out. A attempt to repair went wrong and I was forced to junk it.
If your is the same as mine, the ash trays in the side panels pulled out to reveal a nut that could be loosened to adjust the mirrors. I don't recall the capacities, but with the water take full (which would serve 4 people for 5 days) we were just at the cusp of being overweight.
The other thing that may not be apparent is that the suspension system uses airbags and you can adjust them as needed. If they have no air, it is a horrible ride. The rear air was in the fender and the front was underneath the coach. You will have to crawl around underneath to locate the air bibs.