I used a canvas cover on a popup trailer and had mildew problems and it gave a raceway from the ground for mice to enter. Cleanup in our wet area in the spring was also a real chore. That experience discouraged me from doing the same with a motorhome. Might think differently if I was in a drier climate and just wanting to avoid sun fade.
On our Class C, I bit the bullet and pay for covered parking @ $115 / month. Don't have room for a structure at home, else I would have one.
History: '08 View, '05 Chinook, '01 Jamboree 24D, '78 Apache Popup, 81 Komfort Tlr,
84 Mazda B2000 'w canopy,
Tent from wedding shower in '96