Been getting along fine with the 5/4 Trex (i think) grei decking board I found five+ years ago. It's flexible and doesn't break, cleans easy too. I use 4x6x10" blocks for the jacks all around, come to think of it found those too, just had to cut them in half. Plywood works nice, but so does hardie siding if it's not the bottom piece.
Daniel & Ms Kitty the cat
2003 Hitchhiker II 30.5 RLBG Full timer since it was new.
2003 Chevy 2500HD D/A w/ air foil, sprayed bedliner, 36gal transfer tank, 195k miles
1996 GMC 2500HD 6.5TD, sprayed bedliner, 338k miles
I have a triple axle, and I hated carrying long planks. Couldn't use the locking blocks because of too ittle space between the wheels. I ended up with these RV Levelers . They just fit between the wheels, and I just back up until level. Work great for me.
I have been carrying the same 2 2X8's along with a couple pieces of plywood for a few years and never had a problem with them splitting.I also have the locking blocks which work great on asphalt or very hard surfaces but found they sink in wet or soft dirt.
I have both long wood planks, and a set of the lego blocks. I prefer the planks-the lego blocks sink into the ground unless it is as hard as flint,also fill with mud etc., and can cost $$$ if purchasing two or more sets. The wood planks were salvaged when I replaced my back deck several years back.
I tried using shorter lengths of planks one time, and the first time I pulled the trailer off the front end on soft ground, the rear end flipped up and took out my sewer connection and one valve before I could get stopped. Luckily for me, the tanks were dry, so no messy spill.
I carry at least three 2x8 planks long enough to back both wheels on one side onto as needed, plus a few shorter pieces for use under stabilizers or front landing gear.One campsite this summer required almost 6 inches of lift on one side before the fiver was level side to side, but have seen worse at some campgrounds.
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