Sorry, I can't keep my fingers silent any more! This responses on this post are the reason why I quit posting completely on these forums. No one here has truly answered the OP's question. Everyone is side tracked, bashing the OP with WalMart parking etiquite.
Did anyone even bother to read her question? It started out:
"If we stop for a night at say Walmart"...
In other words, If we stop for at night at say (for example) Walmart.... what about my slides if I'm parked on an unlevel suface. Her question has nothing to do with WalMart. But no, everyone jumps on WalMart overnight parking.
Sheesh!
I sent the OP a PM and explained the possible repercussions if extending the slide outs on an unlevel plain.
OK, so bash ME again, and again and again. I'll post again in a few months!