I know all about progressions with mobile detailing setups!
I went from a Chevy Malibu with my gear in the trunk, to a Chevy Tracker with my gear in the trunk, then the Chevy Tracker with a tiny 4x6 open utility trailer, then the Chevy Tracker with a 4x8 enclosed trailer, then a Dodge Dakota with the same 4x8 enclosed trailer, then back to the Chevy Tracker with a 5x8 open utility trailer, and currently a Chevy Silverado with the same 5x8 open utility trailer, and will soon be upgrading to either 5x8 or 6x10 enclosed. Whew!!