Are you sure they're 80" in diameter? Because that does not seem right at all. With that being said, the largest tire covers we offer are the Adco Designer Tyre Gard RV Tire Covers # 290-3966 which will work with 43" to 45" diameter tires.
If you can get back to me with the actual size of your tires, I'd love to help you out. view full answer...