I think you'll be ok without a cover even going down the road. If you have a 3 way refrig I'd set it to auto and let it decide what it wants for "power" as you go down the road. Also, I believe you're better off leaving it open, especially since it ill be under the awning, at the campground.
Days camping (2016)----181 days
Days camping (2017) --- 52 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
12 different RV's