I find the most out of the way place, maybe behind the most remote hangar, and hopefully on some grass or dirt. I don't ask, I just assume it's OK. I have been woken up once or twice by local LE, but it's never been a problem once I told them why I was there. Finding a good spot to spend the night at a GA airport that really isn't set up for it is an important part of XC flight, and part of the fun and challenge. Most small strips in Idaho, Montana, and Wyoming where I spend most of my time, have unlocked shacks of some sort, (the term "pilot lounge is a little too grand for most of these") usually with a couch and a crapper. At the end of a long day, with maybe rains forecast overnight, and no motels in the area, they look like the Hiton

If possible I keep it low profile and don't use the tent.