I use 6" X 6" wooden blocks to help lift my coach. I've been doing this since 1976. What your describing I would lower my jacks (just the two jacks on the high side) so there just touching the ground with nothing under them. Then, I would put the 6" X 6" blocks under the low side and lift the low side only (just the one front and rear jack on the low side) until the coach is level. You lucked out when you didn't bend a jack there $750.00 to replace one jack. Also I never heard of the term you used? I drove truck for 44-1/4 years and they were always know as chock blocks.