I agree that a trailer is best but if you just want to load up one- Home Depot has a Ramp that looks like 3 short ladders that fold up.This is what I use to load my ATV and as already stated you need to decrease the incline by about 6" if not you could be on the bottom of your snowmobile.This ramp is easy to walk up and store.It also has 2 chains that you can hook on the tailgate cables so the ramp does not side out at top lip.