The covers are a real pain to put on and take off, so unless you are thinking longer term storage, a cover is not a great option, especially if you are going to use the RV every couple of weeks. A pole barn or RV carport is much better if you can do it.
I have owned various campers over the past 30 years, and have only covered my camper twice in recent years. We average about 68" of snowfall per year where I am located. The first 3 years we owned our Passport, it wintered at a storage lot in a steel pole barn. The nice thing was that it was protected from sun, wind, snow and ice, the downside was that it was layered in dust, dirt and covered in bird droppings (I should have put a cover on it while in the pole barn). The last two years we owned it, we kept it in the driveway over the winter and bought a 7-layer breathable and vented cover for protection. It takes a bit of time and more than one person to put it on and take it off, and will never fit back in the storage bag. It was a nice cover that fit snugly and had wind straps that kept it from flapping around and causing damage to the finish.
This winter is our first with the new 5th wheel and I didn't bother with the cover this time around. We had an RV parking pad put in before winter and the camper is protected from the sun and wind, but we do get some snow accumulation on top. I have seen no difference yet between covering and not covering, other than the time and expensive involved. I like being able to access everything on the camper for off-season projects without having to loosen or partially remove a cover.