Not necessarily suggesting your goals are workable for most people but if you are looking in this direction, some things to consider
Being In Alabama, you WILL need two AC units.
Room for 5 will need a 35+ foot unit preferably with a separate bunkroom.
When planning around location, IF you are going to have to pay the electric bill separate from lot rent, know that it will be high, 2" thick walls and single pane windows are not great at keeping the unit cool.
Not suggesting or promoting this brand or line, but a unit of this or a similar base design would likely be a starting point.
https://www.keystonerv.com/fifth-wheels/hideout/floorplans/308bhds-fifth-wheel/
This is an entry level 5er Not a 4 seasons full timer unit.
Good luck