Ramp recommendation for large senior dog for Class A?

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.