I use a shell on my mowing rig. I keep everything with me. Works great except the constant moving of things off of something else. After 5 years of total maintenance accounts I have it down to getting at things used daily very well. But, I am going to spend this winter making a rack and carrier system for everything in the back. Have said that for 5 years.
I was going to buy a enclosed trailer until I watched other companies moving everything out of the trailer to get to something, looked like a garage sell in someone elses front yard. I admit that nothing looks more professional than a nice enclosed trailer with some really good signage, but I think my setup works best for me.