Use wood, we have 1 1/2" to 3" ramp, out of 2 by 10 for drive up on really bad camp sites, but we usually can jocky back and forth a bit and not have to use any thing. I have gone back to a campground office and asked to be moved to a site that was level, they always look so suprised "that sites not level" well no, it wasn't before I got here and won't be after I leave but I won't use it.
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