Thanks for the info...looks like we will have to time things just right for the weather if we do D.C.. We have all been there before except my son. The zoo is on the must do list, and probably the monuments at night...which I've already seen but still awesome none the less.
I was just kinda worried about running into tougher grades through Pennsylvania, but makes sense that the interstates wouldn't be too crazy.
We want to go out west at some point, but I've already explained to the DW that a new truck is going to be in the works for when we do that. She needs a new vehicle herself and I've been trying to talk her into a nice truck...but she isn't feeling it lol.