We were in the same boat years back, also live in desert with high winds. Haboob winds. We built a metal carport, open on both ends, so that the winds won't take it down. DH made it with all aluminum studs and galvanized top. The siding we screwed on shade screen to the studs and then matched the house with plastic lattice to hold screening on. This left plenty of air through on the sides plus shading to protect the TT. We were afraid of enclosing only the sidewalls due to the high winds. Our RV port is 22' X 38'. We originally built it in 2004 for our PUP, like you the sun does so much damage. Had to raise it in 2010 when we purchased the first TT. But we only raised it to 12' 8 in the front and 13' 2" in the rear to fit the new TT. We purposely built it 2" higher in the back for rain drainage to the front. If we were to start all over (hind sight) we would have built to the max height by city code of 15'. We didn't expect to upgrade when we first built it. All of our toys have stayed newer looking due to being covered. I hope this helps.
Joe and Mary Anne
1 20 yr old DD
2014 Ram 2500 Diesel Laramie Mega Cab 4 X 4
2011 Jayco Jay Flight 26RLS-Sold
2014 Jayco Eagle 298 RLDS