1. I can stay dry in the rain 2. I can use my home made urinal that is built into the trailer(For all the coffee I drink) It beats going to the bathroom in your customers yard 3. I can hide from my annoying customers with the little room I built with door so nobody knows I am in there. 4. It is nice pulling in at night and not having to unload equipment. These are just some of the reason I perfer and enclosed trailer over an open one any day.