You may want to go check out Holiday World and Camping World in Katy since these guys sell a lot of trailers and have plenty of used trailers to select from. Also these guys maybe able to recommend a camper for your proposed type of environment.
Also keeping a camper on the gulf coast exposed to the salt air will take a lot of maintenance. Washing/waxing and painting the frame will be a constant maintenance items.
I would suggest doing your homework on the maintenance part before I would pull the trigger on purchasing a camper and parking it in the salty air.
In addition I would stay away from any campers made by Keystone, but not limited to.