We use levelling blocks occasionally, as sometimes you have to park with the back into the wind and the bed (upper) might slope too much the wrong way. I just test the level by putting a round thing (pencil, lipsalve) on the glass kitchen top & seeing which way/how much it rolls. If it's not much we don't bother.
I would have thought it's possible to run up onto the blocks with a ten-year-old to help - set the blocks yourself, & just get the kid to shout STOP when you drive up to the top of them. That's basically all we do.