I use to always carry 3 2X10's about 42" long in our old hybrid, since the storage was so small about all I could fit was the poles for the fold down beds and the planks. But when we got our Grey Wolf I decided to try something different, I moved the battery all the way over to one side in the angle iron supports. I put pieces of wood, 2-2X4 2-4X6 and 1 6X6 (the 6X6 goes under the tongue jack) that I cut to length and secure with a bungee cord. The wood is mostly used for under the stabilizers, but if I only need about 1.5" I will use the 2X4's under the tires. Otherwise I bought a couple packs of Lynx Levelers, that I use under the tires most of the time. But after cracking one of the blocks on a rock, I now always place the blocks on a 8"x42" piece of rubber conveyor belting, plus the belting keeps the dirt and rocks out of the blocks.
TT-2013 Passport 3220BH
TV-2004 F150 FX4, not exactly stock...
with 2001 Kodiak K215: 2010-10, 2011-12
with 2012 Grey Wolf 26BH: 2012-19, 2013-24, 2014-11, 2015-6
with 2013 Passport: 2015-13, 2016-15 booked