Have you got a mfgr for the steps (any names or tags on them?)....or even contacting the coach mfgr would help.
Some coach mfgrs (such as Winnebago) have extensive parts availability.
If you can't find anything, can you take the box off and bring it to a welding shop, and have them make one out of sheet metal? Not sure what it would cost, but if all else fails, it would give you a basically indestructible cover:)
Good luck with your search.
Bill & Claudia / DD Jenn / DS Chris / GS MJDogs: Sophie, Abby, Brandy, Kahlie, Annie, Maggie, Tugger & Beau ๐RIP: Cookie, Foxy & Gidget @ Rainbow Bridge.๐2000 Winnebago "Minnie" 31C, Ford V-10
Purchased April 2008:B FMCA# F407293
The Pets