I'm currently looking for a rooftop tent for my Yukon.
The Tepui style fold out tents are like huge bricks on top and kill gas mileage.
That got me looking into pop up style fiberglass or aluminum tents with lower and more aerodynamic features.
I've got it narrowed down to these two here:
#1 Mass produced Chinese one that goes by a few different names. Looks like most of them put their name on it and add about another $1500. This is the cheapest one I've found, ships direct from manufacturer:
https://doublesteps.com/product/trustmade-hard-shell-rooftop-tent/
#2 I like this one a lot. The main thing is its only 7" tall when closed, and also mounts to the rails on the roof not the crossbars. This keeps it a few inches lower.
https://roofnest.com/product/falcon-xl/