Jim, wrote:
I have a 23' Chapperalle. and double axle trailer (total weight est 5000
pounds.) I'd like to tow it up a ramp and into a storage yard then
launch once/year. Ramp is about 20% and maybe 20' long, the yard is
less than 100 yards away.

My vehicle is a Chevy Malibu with a wheezy 4, and the trailer has an
electric winch.

Think if I stayed in Low, and went slow I could do it?

I would look for a friend with a pick up truck or rent a pickup truck
twice a year.