Motorcycle 12V LED Supply Design

I’m looking for an experienced automotive/power-electronics engineer to design a compact and reliable power interface between a motorcycle electrical system and an outdoor LED display. Electrical requirements Input: standard 12 V motorcycle electrical system, with normal voltage variations and automotive transients. LED input: 12 V DC nominal. LED acceptable input range: 10–12 V DC. LED current: 1.4 A nominal, 4.8 A maximum. Required output: stable and protected 12 V DC. The design must address Voltage regulation. Reverse-polarity protection. Automotive voltage spikes/transients and load dump. Undervoltage and overvoltage protection. Short-circuit and overcurrent protection. Thermal protection/management. Correct fuse and cable sizing. Outdoor motorcycle environment, including vibration, water and dust. I prefer the simplest reliable solution possible, using commercially available automotive components or modules where appropriate. A custom PCB should only be used if it provides a clear technical or manufacturing advantage. The electronics will be installed in a compact IP65/IP67 enclosure and connected to the LED through a waterproof M19 2-pin connector. Deliverables Complete electrical design and wiring diagram/schematic. Selection and sizing of all components. BOM with exact manufacturer part numbers and suppliers. Fuse and cable specifications. PCB design/manufacturing files if a PCB is required. Thermal and enclosure requirements. Assembly instructions. Prototype test and validation procedure. Recommendation of a supplier/manufacturer capable of producing the finished unit. The design must be ready to manufacture, not only a conceptual design. Experience with automotive power electronics, ISO 7637-2 / ISO 16750-2 transient protection, DC-DC converters and motorcycle/vehicle electrical systems is strongly preferred.