My plastic lego blocks look like an elephant has been stomping on them :) I used to use 2x8x2' cut with a slant with barn door handles on the square end. after 12 years of continuous use they began to disintegrate. Never had them on my DP. A friend hung up his keys and gave me some square pads made from plywood and screwed & glued together and epoxy coated. They are things of beauty and will out live me. In reality don't overthink this, an 8 foot 2x8 cut into four boards will give you much of what you will need, add another cut into 8 1 foot boards will be into overkill, find a more level site, but if you have room to carry it you will sleep well at night. When they disintegrate just replace, its wood, not gold.