Good news! the 4WD model gets you 20mpg highway, instead of 24mpg (EPA). So in the long run, this will be cheaper. I've been on the lookout for a manual 4WD Previa, with the intent of swapping in the diesel motor. It's a crazy idea if you're up for it. I don't know if the gas and diesel transmissions are interchangable however.
I guess since you use this quite often that isn't a practical idea. Plus the motor is really hard to find, and around $800-1200. The supercharged 2.4L is much easier to find..
.....just the motor enthusiast in me rambling on.....
I'm rooting for you, I love the Previas.
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