Planning garage or carport for my "new" B

Now that I have my LTV, I want to strain the budget a little more and get a carport/garage for it.

If you have one, could you share your dimensions? Finances decree that it be as small as possible, but not so tiny as to require greasing up the van to get it to fit inside. I'm thinking of one of those metal ones, with partial side walls and, hopefully, a roll-up door as well.

As always, suggestions/what worked/what you would change/ eagerly anticipated from this friendly, helpful community.