Do you know if they are still in business?
They do make covers for a class c. I had taken measurements for my class A to be sure and they steered me into the right size cover for my motorhome. So give them a call they were very helpful to me.
You could call them, but beware. I was guided towards a particular cover for my pontoon that I was reassured would work as a mooring cover, but it did not. It was way too large, and it took nearly a month for them to acknowledge the mistake, authorize a return, and for me to get my money back. I had to threaten to contest the charge with my credit card company twice.
Thanks! Your answer is awaiting moderation.