I recommend the Camco UltraGuard Pop-Up Camper Cover, # CAM45763 for campers that are 12'-14' in length. This will be a snug fit in the width but have extra length. Simply cinch the fabric in on the ends for tight fit all the way around. view full answer...
The etrailer hitch you mentioned is 45-7/8 inches, so much narrower than you need. For a trailer like your Fleetwood Evolution, you'll need an adjustable width hitch as there isn't one that is 60 inches on the nose. So what you can use is the following:
- Adjustable Width Trailer Hitch Receiver for RVs, 22" to 66" Wide # C13704
The # C13704 is for frames between 22" and 66" with the hitch crossmember being 68-1/2" long BUT you can trim the crossmember to the exact dimensions you need... view full answer...