Are you asking what you can tow or what camper to buy?
Sounds like you plan to park more than drive if you will stay a month at a time in each spot, so don't over-think the towing aspect. If truck can tow it then it can tow it.
First time buyers of campers will make lots of mistakes. Those mistakes is what I would suggest research. What you think u need and what you will know you need after a month owning it are far apart.
Also, tell us what the camper is for... will you be staying in it during the day or will it just be a place to crash at night? If you will spend daytime hours in it a lot then u will want a nice living room area where u can walk around, if just a crash pad then a nice bed, a place to shower and a kitchen to cook in and a place to sit like a couch is all u need. Will you stay inside or stay outside during the day? do u need an outside kitchen too?
For just you I suggest going as small as possible. Having a slide-out will give u small camper that gets big parked.
Layout never mattered much to me. In most campers you can almost stand in one spot and touch everything in the layout anyway.
Things in campers are best when they serve two purposes, as it saves space...