I haven't seen any signs either but there are some large trucks (18 wheelers) Park in there when I go late and a few RVs. Personally I would park over there next to the trucks and only stay one night. It's always good to go in and ask at the customer service desk however I would ask after 5, because you don't want to end up on the side of the building that closes their doors early which is the pharmacy side. Also if they advise you to park on the pharmacy side I wouldn't I've seen too many people that didn't look conducive to privacy - noizy maybe drugs I'm not really sure.
Every Walmart has different rules about overnight RV parking. I would call them and ask. I did not notice any signs posted but I didn't ask them either.
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