I wish I'd seen this earlier (before you ordered). I went through a bunch of research and found the best items and the best prices at a place called DiscountRamps.com, a company I'd previously dealt with when I was looking for a scooter carrier. For the past couple of years, I've been using this one:
https://www.discountramps.com/pet/dog-ramps/p/DR615/ They have a number of sizes, both widths and lengths, on this page:
https://search.discountramps.com/search ... =dog+ramps. But the one I chose is great, because it fits in my car and in the airplane, in front of the back seat. It's very light, very sturdy. The only modification I made to it was to install a better latch to keep it closed, as the web strap affair that it came with is awkward at best, especially with gloves on.
It took awhile to train my dog to go up it, as it frightened her at first. She had gotten to the point that she couldn't jump into the car, so it was necessary to save my back. And she still occasionally slips on it, usually because she tries too hard. Most of the time, it's a winner. It not only helps her going up, but getting out of the airplane, also (she still insists on jumping out of the car). So expect a little training time--not all dogs will require it, but I suspect many will.
Cary