I think that Brian organized the space with the OX people? Am I right? I believe its not too difficult to get a camping area set aside for truck campers. However, it is very difficult to keep the area exclusively for TCs. We'd awake in the morning with bikers, tent campers, carousers and others that had moved in overnight. Nice folks for the most part....but they split our camp up pretty thoroughly.
If Brian is not doing it then try to get in touch with Roseann and Jonathan Hansan who are the proprietors of OX.
You will be stunned by the mass of expedition vehicles and the tough smart folks who attend the Expo. Great exhibits by TC vendors such as Lance, 4Wheel, and others. You'll learn more in 3 days than in a year otherwise. Best of luck.