Well really, squatting is squatting, whether you stay there for a night or forever. If there's no owner, that equates nobody to press charges. Yes, mold can be an issue, look I agree, I angle for woods too, but if I know it's going to rain, I generally try and squat. Also, I'm the one stupid train hopper that carries a tent, not a tarp.In my book, thats not squatting. That's just sleeping in abandoned houses. If you ask me, a squat is a communal living in order to reclaim a bank-owned building.
And even with abandonned buildings... except if it rains, I think the risk of breaking in a building everytime you get to a new city is just not worth it, considering the amount of great forest hide-outs, and the fact that every abandonned house ive been in smelled like mold (which is terrible for you).
Maybe im doing it wrong, but thats my experience so far