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For comparison's sake, we bought an enclosed Haulmark with finished walls/ceiling off the lot for a $1000 less than that last year...
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I bought a 1 year old 20' enclosed (actually measures 20' 10" inside

) unit three years ago. It has a walk-in door at the right front and the access door on the drivers' side. Somewhat unfinished inside when I bought it but I've done some upgrades. It had the rock shield (alum. treadplate) on the front and chrome wheels. Price; $4K.
It's served me well for hauling a '70 Chevelle, and plenty of room up front for tools, chairs, coolers, and clothes. I also have an 18' open trailer but I rarely use it anymore. Security of tools, etc. is one thing but the car is just SO MUCH SAFER in the event of BAD weather. "Old cars don't like hail!"