My driveway had such a slope that buy the time I add all the board under the jack, it just does not look stable even with the wheel chocks.
So I jack it level and put concrete blocks and wooden spacers about a foot back under the frame on both sides.
This require less cribbing height, gives me two points of suspension and takes the strain off the tongue jack.
Yes it is a real pain to do but it works well when I need ground clearance check the under side.
Fortunately or normal loading and unloading I can pull it near the back door. k
