We have a Cub camper with an awning only. I was going to have a full annexe fitted, but have changed my mind.
Wife suggested a shade cloth (sun was shining in) so suggested a shade cloth panel approx. 2m x 2m with velcro loops on the top so it could be hung over the top rail of the awning to block out sun/wind or rain (to a degree), and as it's interchangeable, it could be hung wherever it was most needed.
What started this idea was in a CP last w/e, but the park allocates you any site. Because we like coastal camping, most of the weather comes from the west, so it would be best to have the living area facing the east (backs to the wind/rain) which means the drawbar would be pointing south.
So in future if we go to a CP, I will check or ask for a site where the drawbar points south. Not all parks show a sitemap on their website, so I will get them to photocopy an email and choose my own.
Just a tip to keep in mind.