Did Saturdays in our front yard last summer while re-building after the original Hut burned down (the week before Memorial Day no less). Advertised in the local paper, set up signs on the major roads, used Facebook, our website & email newsletter to get the word out. Ran from noon until 5PM or sold out. We were about 1/2 mile outside of town on a road that goes to Plattekill Mountain (big for mountain bikers).
Averaged about 20 - 30 sales across out menu - sandwiches, platters, bulk, feasts, sides, etc. Usually cooked 8 butts, 6 briskets, 8 racks & 4 turkey breasts with 20 pounds mac & cheese, 15 pounds BBQ beans, 5 pounds Mustard Slaw & 5 pounds sweet & sour slaw. Sold out most weekends before end time. On July 4th, we sold out in three hours.
Would probably have had even better traffic in a downtown location. We live in the Catskills - fairly rural. Did a 10x10 pop up for a community day in front of our new location & had our biggest day ever in 3 hours selling nothing but sandwiches.
Then again - road side is a real pain. Cook - set up - serve - tear down - repeat. We only did Saturdays (HD restrictions as we did not have a commercial kitchen) but that was enough to tell me it's not for me. I'll stick with my little take out joint. Though - now that I think about it - overhead is definitely lower in roadside.
PM me if you'd like a few number from the middle of the Catskills.
Cha Cha Hut BBQ : 43311 Route 28 (corner of Route 28 & County Road 38: Arkville, NY : [URL="http://chachahut.com"]chachahut.com[/URL]
Backwoods Pro Jr.
busted Backwoods Fatboy
Weber 22.5 Kettle
some stainless wood fired thing