Hey Vinny,
Are you planning to overnight at a campground or rest area? We usually stop over at Yogi Bear's in Emporia, Virginia. It's easy off I-95 and they have long pull thru sites by the office so you don't have to unhook for the night. That is about 6 1/2 hours for us and should be about the same for you if you use the NJ Turnpike.
Don't forget about the propane restriction at the Harbor Tunnel on I-95. You have to take the Francis Scott Key Bridge to avoid it. Watch re-fueling on I-95 for low clearance!!!! Using truck stops for fuel is a good idea. We usually leave home and make it to the Flying J at Exit 104 in Carmel Church, VA. Next stop is Kenly Plaza at Exit 106 in Kenly, NC.
You are going to love Willow Tree! Did I say I'm slightly jealous? Well then, I'm slightly jealous!