To sell food.
Sidewalk vendors vs sit down places.
Around here it’s settled with permits and zoning.
Around here the only sidewalk vendors we have are hotdog carts. We do have a few truck/trailer operations selling B-B-Q - but you have to be cruising by that corner parking lot and spot them if you want a good lunch.
If they had a good cart vendor around here selling falafil I’d buy.
And zoning has nothing to do with this. That's for buildings and types of businesses.
So a roach coach isn't a "building" type structure on wheels (even though the IRS will even tax a lean-to on your property) and it isn't a "business".