It is spelled out here, F.S.790.25(3)(n) and case law, State v Anton, 700 So. 2d 743 (Fla. 2DCA 1977)
The statute you quote is the same one we've been talking about already. Although it authorizes unlicensed concealed carry in a place of business, I'm concerned whether the fact that the "place of business" is also a vehicle might add some legal complexity to the issue.
As for State v. Anton
, as far as I can tell, that ruling simply expanded the "place of business" definition to include "buildings and structures thereon". That doesn't directly address the "vehicle as a 'place of business'" issue either.