Are you thinking about an awning enclosure (awning add-a-room) like these:
We had one on our previous pop-top (made by the awning maker) and they are made by several companies.
But here in the western US, it was too prone to damage from a wind picking-up too quick for take-down.
It would have been very nice if camping where it never got windy.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV