Store Front or Rear to southern sun

[greger]

We have a Cougar 2018 29RLW with a fiberglass nose and large window at the back. Storing for winter, should I store with the front nose toward the south or the rear toward the southern sun. I have a choice. We live in the north so the winter sun is pretty low on the horizon.

Any pros or cons? Does the fiberglass hold up better than the filon? I'd tape some black paperboard on the rear window?

Thanks
Greg