That bolt must be a 2012 addition. My 2011 Rockwood doesn't have it. Anyway, do you put the jacks down before or after setting up the A-walls? I can imagine a situation where putting the jacks down first could twist the box. I know you said the state of level doesn't appear to be related, but it could be level at the point where you check it and still be slightly skewed. For us, the jacks go down last, though there's been a fair amount of discussion about that issue on this forum.
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator