Wal Mart Parking
You should not be parking in a WalMart parking lot for "a couple of days". The intent is it is to be used for emergency parking and you should arrive late in the day, get permission, leave early in the morning. A small percentage of selfish Rvers have ruined this for others by staying more than one day, putting their jacks down, putting slides and awnings out, setting up BBQs, leaving trash or even dumping tanks on the pavement. This has led to ordinances and managers rejecting Rvers with legitimate needs to camp overnite.
Get a campground if you are going to be in an area more than overnite. If you cant afford it, stay home.