One of the big Clubs like Lone Star Jeep club (DFW area) would be a logical way to get something like that started. Charge a fee for anyone who had something to sell, or for a "space". The fee to cover the cost of renting a large parking lot.
Other major companies like lift companies, Off road tire, off road parks, etc could also get involved. Could be a great marketing event.
Something like the Pate Swap Meet at the Texas Motor Speedway parking lot. At Pate, it is mostly auto parts for ANY THING. But do one and limit it to Off Road Items.
A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models!