As it is your very first post, let me offer you a warm welcome on behalf of all members. Nice to have a new member from the pacific coast. I guess there are plenty of fantastic spots to camp in the surrounding.
I think I saw a post from somebody who bought a similar cover from wayfair that fits an R-Pod for a Plus model. He claimed that this was a pretty good fit. Sorry but I didn't find the post so I don't know the exact cover model. He also reported that door opening was well fitting. Classic covers are also available from Walmart site.
As for a winter experience, I don't think we had any report on this yet.
Hope this will help.