Glad you are happy with your move to our fine state.
The DMV mislead you on "commercial" trucks. 5,000 pounds is the level that a pick up becomes a "heavy" pickup, has increased tag fees and different bumper regulations to name few.
It is NOT the cut off for non-commercial vs commercial.
The Florida law is quoted below for our readers here:
“Commercial motor vehicle” means any vehicle which is not owned or operated by a governmental entity, which uses special fuel or motor fuel on the public highways, and which has a gross vehicle weight of 26,001 pounds or more, or has three or more axles regardless of weight, or is used in combination when the weight of such combination exceeds 26,001 pounds gross vehicle weight."
Happy Camping