I'm really trying to get there next year too. Not sure if anyone wants to caravan wit me though since we'll be doing the RV thing & towing the VX behind (may be a little on the slow side).
We'd be slow too - the girls ride great but will generally demand a food/diaper/bottle stop every 190-240 miles. Not bad, except those stops typically take an hour to an hour and a half by the time we eat, change them, walk the dog, etc.