While 20ft trailers (enclosed) might not appeal to some car crowds, they are becoming more popular in the desert SW to haul/store side by sides, especially ones with added height. Smaller trailer easier to park at trailheads, motels etc.
storing a trailer outside in the desert….. count on buying new tires every two years. I actually remove the wheels from both of our trailers during the hot months. Our boat was stored in the garage and those tires were six years old when we sold it.