Are there any Harley-Davidson dealers in your area?
Weekends are a time when these dealerships have a lot of lookers, current H-D owners and others who are just bored and dreaming of life on two-wheels not to mention a bunch of employees.
Walk into any of the newer dealerships and you'll often find a small food service or "cafe" and they are always busy; folks waiting for their bike to be serviced, tourists buying their newest t-shirt, etc.
Barnett's H-D in El Paso has free burgers and dogs on the weekends for those who make a purchase in the store, big or small and they cook them on a little gas grill and thay taste like crap BUT THEY ARE ALWAYS JAMMED WITH HUNGRY BIKERS!
Now fast-forward to you, some GREAT BBQ and reasonable prices. The smell alone will draw them to you, the dealer benefits if your fare is tasty and people want to come back next weekend (more t-shirt sales) and what food fits in with the biker culture better than BBQ?
Talk to the dealer, ask for a spot, offer to throw on some horrible frozen patties or mystery-meat dogs (at his expense) to give away to the shoppers that buy shirts and watch how quickly they are by-passing that junk to get some REAL GRUB.
I've talked with my local dealer and he sees it as a win-win situation. Of course it always helps when you have laid down $24k for a Harley (gives you a little leverage.)
Just my .02 worth.
-Guppie