I made a set of levelers using a pressure treated 8 foot 2x6.  I cut the
2x6 in half and then each half again into 3 pieces with one 24" one 16"
and one 8" with one end of each cut at a 45 deg .  I stacked the 3 pieces
with the straight cut all at one end and screwed them together.  If I have
a campsite on which I need to level, I place one of those bubble levels
with 2 right angle levels on the sink cabinet and place one or both wood
levelers under the wheel(s) that need to raise up and just drive up to the
step needed to level the van.  The two levelers nest together and I
usually store them behind the passenger seat.  I have also put them up
above in the storage area with bungee cords.

Evans Waldron
83.5 Westy Dabus