eric, ive been using your rocks since 2012. really appreciate you making them so available for everyone. ive also been using your sticks and logs as well. hope you don't mind since you've left a lot of them in my neck of the woods
hell, one time, I even used my motorcycle tote for leveling without even realizing it.
we always seek water to park by, and naturally the earth always slops to waterways so the passenger side almost religiously gets parked on erics stuff. sometimes we dig holes on drivers side to keep from using too many of his rocks.
we also have a bubble level installed in our center console like this one
as long as we get the van parked within the second circle were level enough to not sleep drift. you can get them on amazon for around 3 bucks. I picked ours up at lowes, but it was so long ago I don't remember the price.