Use extreme caution gents if using wooden ramps that are not re-enforced with steel on the edges.
A local man near where I live, was loading his 4 wheeler in the back of his truck with homemade wooden ramps/planks, one broke as he was half way on the truck, the 4 wheeler flipped off to one side and landed on his chest.............he nearly died. Crushed his entire chest, broken pelvis, fractured skull, etc.
Sometimes one does not think it can happen to them..............
FDXX75