Which dog ramp for class A mh?

We have a golden retriever who is the same weight who started having problems with the steps as he aged. I went to a Pet Smart and bought a collapsible ramp that was made out of plastic and folded down into four sections. The packaging said it would support 100 pounds. And it wasn't cheap either, over $100. They lied on the packaging. It was a cheap piece of junk that won't even stay level much less support 85 pounds. I haven't gone out and got a replacement for it yet. I write you this to warn you about the cheap junk out there. You are going really high in a motorhome so you need something that is long and with carpet on it so the dog can get traction. I'm not shooting for getting all the way to floor level, but probably to the top step. Something to go from the ground all the way to the floor level would probably have to be 10 feet long or more for the dog to be able to use it.