I think the "weight off the axles" answer is pretty accurate. Any time I extend the level-up system too high, I get the strange creeking, groaning, clunking sounds too, especially when parked on hard surfaces. I think it has to do with the trailer flexing and moving around a bit on the level-up legs because too much weight is off the axles. Any time I can set the system to keep more weight on the axles, I don't hear and feel all the noise as much. On the other hand, I kind of like being able to walk under the front overhang without having to bend the old back too much. Oh well life is all about trade-offs I guess.
Skip & Susan Orrell
2013 34 RLSA w/ most of the options
2013 Chevy 3500HD, D/A, DRW, 4X4