I got my Haulmark from
HAULMARK TRAILERS At Metro Trailer. Family business, super customer service and you can order the trailers custom made to your specs and pick it up at whatever factory works out closest to you. If my memory serves me, there is one in TN or GA for your area.
If you need to speak with someone, speak with Robert. He is one of the owners and will look after ya!
Two things to make sure you get if you go enclosed. First, a side door so you can open the Vipers driver door so you dont have to crawl out the window (Dont ask me how I know this!

) and two, E track. Best car strap down invention known to man!
Robert