This is the local code for anyone interested. The violation notice specifically mentions, sections C & D. As I said before, mine is under the 8x8x21 rule.
Sec. 122-37. - Storage, parking, maintenance of prohibited vehicles and equipment in residential zoning districts.
(a)
Intent. It is the intent of this section to prohibit the storage, parking or maintenance of prohibited vehicles in residential zoning districts in order to prevent traffic and safety problems endangering the lives and property of citizens of the county, to prevent unsightly appearances in residential areas, and to prevent diminution of property values.
(b)
Definitions. The following definitions shall apply to the provisions of this section:
Commercial purpose means a use for compensation, including but not limited to the transport of persons, animals, commodities, materials, articles of trade, or the performance or tender of services.
Prohibited vehicles and equipment means and includes, but shall not be limited to, any truck, trailer or stretched and/or extended automobile or sport utility vehicle in excess of 21 feet, or any semi-trailer, tractor trailer combination, or truck tractor as defined in F.S. § 320.01(11), or any step-van, cube-van, box truck, flat bed truck, tow truck, wrecker, moving van, bus, or any construction, landscaping, or land clearing equipment. The term also includes any vehicle used as a platform for a derrick, hoist, crane, compressor, tanks, ladder racks, or similar equipment or as a means of transporting or storing a prohibited vehicle. "Construction, landscaping or land clearing equipment" as used in this section shall include, but not be limited to, any front loader, bulldozer, dragline, crane, or similar vehicle, or any tar pot, concrete mixer, trencher, stump grinder, brush shredder, or similar equipment designed to be towed behind a motorized vehicle.
Residential zoning district means the boundaries of an area of the unincorporated part of the county designated by a single zone residential classification with uniform use regulations, and includes private and public property. When streets or alleyways are used to designate boundaries, such boundaries shall be considered to be the centerline of such streets or alleyways.
(c)
Prohibitions. No person or agent thereof shall cause or permit a prohibited vehicle to be stored, maintained or parked in a residential zoning district unless such vehicle is parked on private property in an enclosed garage or similar lawful structure, thereby eliminating its visibility from public roads and adjacent parcels of land. However, one such vehicle may be parked on a residential property for no more than 30 minutes during the normal lunch hours of 11:00 a.m. to 2:00 p.m., not to exceed one 30-minute period per 24-hour day.
(d)
Exemptions. The provisions of this section shall not apply to the temporary parking of prohibited vehicles in residential zoning districts for the purpose of delivery or receipt of goods or services at a specific residence. Additionally, for each residential dwelling unit there may be one van, pick up truck, or utility trailer, with attachments such as ladder racks, utility beds, flat beds, glass racks, side racks, or elevated tool boxes. However, the vehicle together with any and all such attachments and/or cargo and equipment shall be no more than 21 feet in length, eight feet in height, and eight feet in width. The vehicle must be parked on a prepared, inorganic, hard surfaced, non-dirt, parking area and not on the grassy or vegetated area of the yard. This section is not intended to include operable boat trailers with or without boats, or other recreational vehicles as those are addressed in chapter 138 of this Code.