With the pop up, I always covered it between trips and over the winter because it wasn't hard to do and I could do it myself in about 10 minutes. It helped it keep it clean etc. I do have a cover with the hybrid as well, and when I get it back from the dealer I will cover it over the winter or whats left of it.  ::)
Used breathable covers with both, thats whats important so it can breathe.

Best Regards,
Norm

If you are going to use a blue style tarp to cover the camper I recomend placing an inflated beach ball between the camper and the tarp. It will keep air flow and will also direct water and snow off the tarp so it doesn't pool