Kenny, I would just run that van of yours as is. If you are lucky enough to have the factory tow package, it will have 3.73 gears (with Eaton G80 locking diff). Not to mention a Class III hitch for bikes and emergency recovery with a receiver shackle. Throw some new AT's on there (factory size 215/75R15 if no lift, 235/75R15 with modest 2" lift) and you are good to go. Just be sensible in the places you try to get to (you mentioned beach camping, for example) and use all the money you saved for your road trip.
I have an AWD but honestly if it wasn't for winter up here, I would be perfectly fine with a 2-wheel drive. Better on gas, 500 lbs. lighter, better ride, etc.
If you really want All/4WD just buy an AWD. But save your other one for highway cruising duty since you got such a good deal on it
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
(I'm working on a fleet myself)
Either way, I'm looking forward to following your build and upcoming adventures!
Jason