How to transport a dirt bike?

So I’m down in NC for vacation and while here I figured “Why not shop around for a dirt bike?” I live in NJ and while looking around there, everything is twice as expensive.

I’ve found the perfect bike but now my problem is transportation. Here’s the situation:

1) I don’t have my motorcycle license so driving is out.
2) We’re in a minivan but it’s full of people and luggage.
3) I don’t want to pay some company to haul it because that would cost too much.
4) Buying close to home is too expensive.

I’m hoping there is some kind of cheap bumper hitch I can attach to the van. Any suggestions?

(The Van is a 2000 Honda Odyssey and the bike is a Kawasaki KLR 250)