What is the best/worst you've done when selling at a swap meet?

I hadn't sold at a swap-meet in decades, and decided to do a couple last year.

I went to a local mopar show in Jan, with a minivan full of stuff and sold 2.5K in one day. That was pretty good.
Went to a local outdoor mopar show in the spring, and sold 6K of stuff out of my minivan, in about 5-6 hours. Splendid.
I went to the nats last year. First day [setup] I sold 11K in parts. Friday and Saturday....2K. Dealers were buying....
I went to the new Norwalk/mopar show/race....hardly covered the nut for the weekend. That was poorly advertised.

I'm not physically able to lug stuff around now, and am sitting-out this year for selling at swap-meets. Maybe after another back surgery.