I read an article some time back that screwing exterior grade plywood onto the top and bottom of PT 2x lumber eliminated the splitting problem. Presumably it either helped distribute the weight better - or maybe just kept the split pieces contained.
That does work. I use mine under tires on one side also to level left to right. I never need it that thick so I bring @8 of the plywood pieces to stack as needed.
Watch out for nails and screws if the pieces separate.
2013 Rockwood 8282WS
Reese Revolution Pin, Reese 16K
2008 Tundra Limited Double Cab 5.7L
Air Lift 5000 w/Wireless Air
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
I have 3 sets of the orange plastic blocks (10 packs) and use the all the time. I put some under the stabs and tongue jack and have stacked them for wheel leveling. They are light, store easy, and are strong. They are much lighter than wood and don't absorb water.
Stu and Debbie
USAF CMSgt (RET)
2014 FR Super lite 27
2015 Ram Big Horn
8X8 pieces of 3/4" plywood. I carry 12 of them. Where I park for storage, I have a couple of 2X12X 6' PT lumber to keep the tires off the ground. They help me get the trailer back in the same spot each time, too.
J & D in Lovely Weatherford, TX
2016 Jayco White Hawk 28DSBH TT
2014 Ram 2500 Crew Cab 4X4 6.7L Cummins
One of our local parks doesn't allow the plastic leveling pads - you are required to use wood. Their reasoning is that in the heat of the day, the weight of your TT or MH will "press the plastic" into the asphalt. They even have a stack of wood by the ranger station for you to replace the plastic with.
We carry 1 x 6's with us and have stapled a "handle" on one side made out of ski rope and made a pusher/puller out of PVC pipe for ease of placement/removal under the jacks of our MH.