Don't know about a Performer, 'cause I missed the chance at my 1st one last week.......but a standard kettle maybe thirty medium size, if you're careful.......
Roadside is a hard-char kind of a thing, if I'm remembering right, so maybe cook batches to most of the way done & then stack 'em up in pans ( if you need to for however many ) & set the pans back on at the end to finish & keep warm.....hope this helps.....