Large paved parking lot east of Buffalo Bill’s Casino that is easy to access, well lit, and level. Security patrols throughout the night, but never bothered anyone. Trucks stay in their “area” and RV’s in another.
There are good fast food and sit down restaurants in the nearby casinos. Some require a bit of walking.
Fuel is available at the Flying J travel center on the other side (west side) of the freeway.
I parked here 2 nights with the truck drivers on the Whiskey Pete's side. No propane in Primm April 2017. I ended up out here while I was trying to get propane in Vegas and got sucked into the rush hour traffic vortex and just wanted to get out of Vegas!
A lot of the trucks do keep their engines rumbling. I call it "sleeping with beasts". I would have no problem heading back there and venturing inside. I usually try to, but I wasn't feeling well.
Just got back from Vegas and we did stay at Primm Valley. They had a parking lot that was full of RV's and it was a nice fairly level lot and far enough away from the highway that you didn't hear it much. As far as I could tell they did not have an RV Park there. Thanks for all your information.