Yes, easily. You will have to plan a bit, but the long parts (HS Spar, J-stringers, etc.) will be the most difficult. I don't know how the seats are managed in the Voyager, but if the mid seats can either be removed or laid flat, then pack the small parts and bags to make a surface for the skins. Flat skins first and the folded skins (HS and VS) should be taped together at the trailing edge, which will give them a springy strength. Pad with blankets. Long parts over everything else; I would not risk them on top of the van if I could help it. If the tail cone side skins are too long to fit flat behind the front seats, allow them to roll up a bit at one end or both; they are flexible enough to do that without taking a 'set'. Just don't put anything on top of them where they are not laying flat.