Check out the Pit Barrel Cooker. Everyone I’ve recommended it to has loved it. I’ve had mine for over two years now, use it at least weekly, year round. I’m not sure if this is still the case but the owner of the company used to put his own phone number on each barrel and would personally answer questions. I found out about it via the review section of amazingribs dot com. I’ve probably cooked a few tons of ribs, brisket, pork shoulder, tri tip and chicken in that darned thing.
I think they’ve got a smaller sized barrel now which would be great for your van shenanigans.
Anyway, if you’re ever in the Seattle area and you want to check one out, let me know! 
