I don't know about hotels and chains, but some motels and casinos do have RV sites or parks associated with them. Often they give you access to what facilities are available, like restaurants & recreation facilities.
I have compiled a list of the higher rated RV parks around the country over the last few years (low 7's to 10 on a 1-10 rating scale). I suggest you refer to your favorite RV search and rating site and do a name search for "hotel" and/or "motel."
Below is an extract from my collection. I have only stayed at the Hollywood Casino in MS and the A+ Motel in LA from this list and they were both fine. I have heard good things about the Marathon Motel and RV Park.
Blake Ranch RV Park & Horse Motel, Kingman, Arizona
Newberry Mountain RV and Motel Park , Newberry Springs, California
A+ Motel & RV Park, Sulphur, Louisiana
Hollywood Casino Hotel & RV Park , Robinsonville, Mississippi
Edgewater RV Resort & Motel , Lakeside, Montana
Saddle West Hotel Casino & RV Park , Pahrump, Nevada
Cinderella Motel & Campsite , Grand Island, New York
Siding 36 Motel and RV Park , White Lake, South Dakota
Scenic View Motel & Marina, Lone Star, Texas
Marathon Motel and RV Park, Marathon, Texas
Sandollar Resort Motel and RV Park , Rockport, Texas
Leeds RV Park & Motel, Leeds, Utah
Barron Motel & RV Campground , Barron, Wisconsin
Lazy Acres Campground & Motel, Riverside, Wyoming
