Oh My God!, these things are fantastic.. I have a pick up truck, and a riding mower and motorcycle that I constantly load/unload.. I didn't want to pay the 200 bucks it cost for decent ramps, So I purchased 2 2x10's that are about 12 feet long i think..  I've been using these to load and unload onto my truck and a trailer I borrowed from my mom, but eventually gave back, so mostly my truck..  man, it SUCKED..  going up into the truck there is a lip at the end, from laying it on the tail gate, so basically, a drop off..  which wasn't horrible loading, but un-loading, man.. the wheels kept pushing the boards off, and also, the deck on the mower would catch on the lip of the board..  HORRIBLE...  I bought these and put them on.. and it makes everything flush on the tail gate.. after I installed them on the boards, I put them on the tail gate, pulled the mower up on the truck, and then backed it down off the truck, all by myself, without anyone holding the boards..  WORKED FANTASTIC...  why did I not buy these things sooner?!?!?!  I won't make that mistake again..  love these things, and I'm sure you will too.