If you stay on 15 south through Point of Rocks, MD and follow it to either 17 or 3 you can avoid the beltway and traffic. We live right off 15 by I66 and usually take that route and get to I95 just north of Richmond! It has been worth the reroute for us.
I think this year I may try to leave early afternoon and get south of Richmond the night before the big push and shoot for St. Mary's KOA instead of Savannah South KOA....though we liked the pool at Savannah South so we might just go there again. Then we usually go for a long push the first day so we can get there early and relax the second.
This is our trip plan if we stop in savannah. First day is a long push to Savannah, usually leave around 6am, and we are on the road 10-12 hours depending on traffic and stops. The following day takes us around 5.5 to get to Disney. The return trip we are stopping to visit friends and will be going about 8 hours north to Santee Lake are then another 9 hours home from there 2 days later.
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PS: I love RV Trip Wizard. I set my travel speed at 50mph, which is about what I average out when towing with bathroom breaks, etc.