We have used a Petstep folding ramp to get our two older Goldens in and out of our 5er. Arthritic hips would not allow either to do even short multiple steps. The Petstep ramp is very stable and the surface is non slip. I set the top end of the ramp on the top step. I set it to one side of the step so that we can still use the steps with the ramp in place. They walk up the ramp and are able to make that last step into the 5er. I fold it and set beside the hitch when traveling. I also use it to get them in/out of the truck back seat. I can no longer lift 70 lb dogs in and out.
We first tried a plastic telescoping ramp. But it was far less stable and the surface more slippery. Dogs didn’t like it.