walmart and sam's clubs

We find a Sam's club at the exit we took and they are just closing for the night. Reid goes in to talk to the manager and she says it's ok to stay here but the walmart in that county doesn't allow it. so we stopped at the right place. The parking lot is fairly empty and no one else is boondocking there but she said it's safe and there's a night shift stocking in the store and it's well lit and trucker's will sometimes pull in for the night. so we get a spot near the side road with a little grass for Lady and we're all set. We have the room for our slides and we run the generator for a while to cool us off. About 9:30 Reid heads off to bed, with out the air on I know it's not going to be comfortable in bed but theres a nice breeze so Reid takes the bed and I take the sofa and we have the windows up. I didn't figure I'd sleep anyway cause I don't like boondocking so I figured I'd just sit there on the sofa till morning. I did fall asleep around 10, I guess I was more tired that I thought..About 11 I heard a truck pull in and park a row over from us, It was a walmart truck so I felt right at home. About 2am there's this pounding on our door and I jump up, Lady's barking, Reid's getting up and the pounding continues and it was this man drunk I believe, he's wanting money for "crystal" ( you figure it out) and then some story about running out of gas at the pump and needing money for gas to get to his son's surgery... we tell him to go away and leave and he did leave and went to the truck and knocked on his door. I'm watching from the window with the cell phone in my hand ready to call 911. He finally leaves the truck and then gets in a waiting car with someone else driving and they pull out of the parking lot...(thought he was out of gas) Any way at this point we're not going back to sleep and we're not sure he want be back so at about 2:30 we're putting slides in and heading out of town...we don't like driving at night but we did it. I just didn't feel safe staying. We got fuel about 4 and we heading through Houston about 4:15 guess what, not a bad time to travel through the city. We arrived on our site about 11:30 and we were glad to be here. Sam club parking lots are out..maybe a walmart if the store is open and there's other RV around...we'll see.