I've read "BAL Leveler" referenced in many posts. I finally did a search to figure out what they are. Okay, now I know. My question is...are they really necessary? I remember growing up family members would use stacks of 6" wide boards of varying lengths to level a camper. I suppose that just adds weight - something we didn't think about then. Any idea what percentage of PUP owners use the BAL levelers? What has been folk's experience with them? Do you find them worth the cost? (Camping World has them for about $90). Thanks for the education!