I had a '93 Country Coaches (I think) conversion with the 10" Progressive wheels just like the ones pictured on that maroon truck. Mine had 275/60's when it was bought. I later down the road changed to a 295/50 on aftermarket chrome 15x10's.
Go to this link. Pics are towards the bottom of the page. The first set of chrome wheels (with phantom grille) are with the 295/50's. The second set you'll see from earlier days with factory paint & grille had 275/60's. The high school Senior pic with the Progressive's also had the 275/60's as mentioned before.
https://www.flickr.com/photos/985431...h/26050244846/