Welsome from Delaware - we also have the 274 DBH.
Travelling with kids is fun ... especiaally if they all have their own ear buds / headphones
We travel with a 9 & 12 year old, as well as 2 large dogs.
Plan on stopping more frequently, I've found that I like putting a few gallons of water in the fresh water tank before we leave, when the kids say they have to "go", we pull over and open up the camper for them - it's litterally a rolling rest stop never further than 3' behind your tow vehicle.
We also try to limit the amount of time we travel per day - we try to keep it under 4 or 5 hours - not so much for the kids but I get cranky sitting still that long.
We're planning a trip to Moorehead City NC in November and will stop off in Williamsburg VA for a night to keep everyone (read "Me") happy.
I'd also reccomend some board games in the camper, and a few DVDs for rainy days.
Add in some stick on tap lights or a bright nightlight in the bathroom, since there's no wall switch the kids will be left in the dark trying to do their business at night.