Monaco has a 3 point jack system. The procedure it to put the front down and raise the front about ~3/4", the front jack acts as a pivot to help prevent the frame from twisting. The back two are used to level from side to side, all 3 to get it level. Air bags are suppose to be dumped prior to using jacks.
Using only one jack twisted the frame and when you let it back down the windshield did not have time to move back into position and it stressed it.
There is a section in the manual that covers the leveling system.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi