Buy an enclosed utility trailer. Install a wall with a door and windows just inside the fold down ramp in the back. Put an air conditioner on the roof, and there you have it. An RV with a back porch! 
We’re in San Angelo. 2018 May Colorado Trip Another nice KOA Campground. 
(Most KOA campgrounds are nice. The one in Lubbock not so much.)
We’re in San Angelo. 2018 May Colorado Trip Another nice KOA Campground. (Most KOA campgrounds are nice. The one in Lubbock not so much.)