Traffic shouldn't anymore trouble than normal. The airport connector project is done north of the airport. Make sure to try Bartley's BBQ; it doesn't look like much, but the food is great. I live 12 miles from the airport and you're welcome to PM me with any questions.
Treetops Resort had been our camping spot, then we stayed at Cedar Hill State Park last Oct. I liked it for it's country, state park atmosphere even tho it's surrounded by the megatropolis. It's 20 mi. from DFW.
X3 It seems that you will be nearby while in Dallas, but one time we were at the Vineyards camped down along the lake and had to move up to a space on higher ground due to water rising. Don't know if this is a common happening there or not but it was not a particularly rainy day.