I made a ramp out of a wide, aluminum motorcycle ramp for our girl. i reinforced it with 1/4" plywood and small sheet screws ( she weighs 80 lbs ) the just glued the softer indoor/ outdoor carpet from Home Depot onto the top.
She has pretty bad arthritis and cannot handle the 5th wheel steps.
Works great cause it has the no slip on the two tongues to not slip off a pickup. Its long enough so it doesnt have too steep an incline and goes from the inside floor to the ground.
She walks right up and down it.
Everyone who sees it asks how I made it, and wants me to make them one.
Regards!
Cheryl