We will be on our way to Charleston in a couple weeks. Driving from Fort Worth, Texas to Vicksburg the first night and then on to Atlanta for the ssecond night. We want to get just past Atlanta before stopping. Anyone have any suggestions for low cost/free overnight parking? If the weather is not too warm, we can do a Walmart or something similar. However, if it is too warm, we would need electricity in order to be comfortable for sleeping. Thanks!