So long as the cover is breathable you should be fine. Looking at the details for that cover it does state that it is breathable. Last season I had to put my ADCO Tyvek cover on while it was wet. It was dry when I put it on this year. So far I've seen no difference when I've opened the slide flap and checked on things. For me covering is primarily to prevent build up of leaves and pine needles from trees surrounding our lot.
TT: 2015 Jay Flight SLX 195RB Baja Edition
TV: 2014 RAM 1500 Bighorn CC, 5.7L Hemi, 8-spd, 3.21LSD, Factory Air Ride/Tow Pkg, Andersen WD/SC