Crazy Neighbor and I backed up 2 vehicles for camping and hung a tarp between them held on with magnets, well.. haha of course. That’s what we do around here. First reasonable weather camping trip of the year, that was a fantastic change from the last few months. The tarp we used was a 20′ x 40′ and it pretty much covered both vehicles completely, a 20×30 would probably do quite well for the application, however, it was nice to have the windows blocked out. NOT very stealthy, but certainly good camping.