I ended up voting for Labor Day weekend. Traffic seemed ok since I drove up Friday and returned Sunday - I'd expect traffic to be worse Monday. While I imagine Labor Day will compete for a lot of folks time, I appreciated it being that weekend just to allow an additional day for me to take care of weekend chores. If I had to pick an alternative date, I'd choose two weeks in either direction. The week before or after will likely just be a little harder to take off.
As an aside, it was great fun getting to see everyone and their rigs, If you're on the fence I'd recommend going.
1985 F-250 XLT Lariat
2-WD 6.9 IDI
132,000 Miles
Automatic