The fire Marshall said no. The aisles aren't wide enough with them.
How about making the aisles wider? Would that be sufficient for the Fire Marshall if all folks are following those safe guidelines? How about asking him what the safe width is needed. 24", 36", 48" or 60" in the aisles for example.
Check the posts on this from the past two years. I think they'd have to ditch the vendors and I remember an issue of the pop ups not being accepted by the fire Marshall. The fines are pretty hefty for violations too. It has to do with emergency vehicles driving thru the site. Guess it all sounds simple until there is a fire or medical emergency. All jurisdictions have their rules and they are all about safety.