RE: Need help with memphis
I live just north of Memphis and the advice you've gotten so far is spot on (as usual, I've been reading here a while). I believe you can stay at the campground at Navy Lake without being in the military, but there may be a limit on how long you can stay. It's quite a nice area.
In Tunica there are two casinos with campgrounds and they're right across the street from one another. Hollywood Casinos campground is right next to the golf course and it's quite nice. Sam's Town is $5 cheaper and right across the street. We prefer Hollywood. The gambling is better there, too. If you're into that kind of thing. The campground that used to be at Grand Casino closed some years ago.
It can be a little noisy in the parking lots, which are right next to the RV park, on weekends. But we've never had any problems staying at either one.
Personally, I would not take a job in Memphis. We're planning on selling our place here and getting as far away as possible. Crime is bad, property taxes that are the highest in the state and for a large city the entertainment and nightlife is absolutely dismal. Recently the city management changed for the better (any change would be for the better) but it will be a long, long time before that makes any difference in the area. It's the worst place I've ever lived. Taxes are outrageous, schools are a war zone and there isn't a lot of nightlife outside Beale St., which you can experience in a weekend.
I'm also a volunteer firefighter/EMS. If you're taking a job with the airport fire department, that might be worthwhile. They are quite good. Well funded. But staying here long term...don't even think about it, especially if you have kids.