I don't know Greg:
I can see lashing down the pontoons on top of the minivan (I have a Ford Windstar), but what about the Mast? This is really long and you need two points near the ends to lash them down and keep stable.
I make sure I have my bearings greased and checked at the beginning of every season, and I've put thousands of miles on a trailer while traveling to a Regatta. When we get to a hotel, I just unhitch it and try to find a restaurant. Why add more stress to your life?
Good luck,
Wyatt