Ramp recommendation for large senior dog for Class A?

My elderly dogs simply wouldn't walk up a ramp (unless it was so stoutly-built that it was impossible to use). I found they were happier being helped up the steps using a "handle" (simply a wide fleece-covered band that went around their chest, with a handle on the top) My late Aussie would wait at the stairs for me to "put his handle on". And MY level of effort wasn't really all that much - I wasn't carrying him, just giving some stability and forward motion.

We use a telescoping ramp made by Solvit to get our 210lbs English Mastiff into the truck. Lightweight aluminum design and easy slide to extend/retract. It goes between 39-72” which could be steep depending on how high you need to go.

See here.

The one I used for my senior golden was...

Here

Be careful of getting anything shorter than 72 inches as it will be too steep.

We have used a Petstep folding ramp for years for our 85 lb Goldens and they use it with out hesitation. Very solid and non slip. I occasionally walk on it myself at 175 lbs and no problem.
First we bought a telescoping ramp with a thin carpet like material to walk on. But the ramp was a little shaky and the material a little slick and they did not much like it. So we got rid of that one.

After purchasing a expensive telescoping fiberglass ramp the Collies hate and was very heavy as well I made my own. Still have the ramp if you were closer I would give it to you.

I used 3/8 plywood and used 1x2 around the edge for strength. I put wide traction tape to cover the top. Very reasonable to build and the Collies are use to using it. I keep it in the back of the truck for storage. You can build the proper length so the ramp is not to steep as long as it will fit where you plan on storing it. This is lightweight and strong (Collies weight is 85#).