No. Living in an RV or camper on a lot in Bay St Louis is not permitted. You can only use RVs or campers as temporary dwellings in designated RV parks or camper grounds that have a Bay St Louis business license.
Fences in residential areas cannot be taller than six feet.
The minimum front yard setback is 25 feet, the minimum side yard setback is 8 feet, and the minimum rear yard setback is 20 feet, except for when the lot is on a canal, in which case the rear yard setback may be 10 feet.