I believe the"vehicle considered concealment"issue came about as a way to combat poaching of game animals by the DNR. But I may be wrong too.
I do know FL allows carrying of a loaded firearm in a vehicle without a CCW permit.
It has to be cased in something though, a glove compartment or center console is acceptable. While a holster with the gun in plain view is not from the information I gathered while living and visiting that state. Their state website is difficult to navigate.