Regarding torsion rod adjustments - here's the link to a primer (mentioned above by Bill) I offered some time ago. The question asked was actually related to final moevement of the shell to its stabilizing latch-engagement position. The procudure in my answer, although incorrect for the particular problem, is correct for adjusting preload on the torsion rods - which is the "raising and lowering" issue.
http://www.trailmanorowners.com/yabb...sg5075#msg5075
Note: If the shell is very hard to raise, coarser adjustments, at the beginning, seems appropriate. The bolts, depending on age, can be difficult to move initially. A few shots of a rust-releasing lubricant may help. Both from below and above (where the end of the bolt contacts the torsion rod, so that it can drain down onto any exposed threads). Or it may not help. I haven't tried, just thinking with the keyboard.
Denny_A