I use heavy duty space blankets - reflective on on side - When it's hot put the reflective side up, cold put it toward the inside, and leave the blue covering the top. Hold them down heavy duty black spring clips you get at the office store. Inexpensive and easy to put up. $17 each, you need 3 of them. A company called Grabber makes them. Over lap two on the front bunk tent. I have been in bad winds and have never had one come flying off.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.