As to exterior lighting youre fine staying with DOT/FMVSS Approved. Thus, Grote, Petersen, etc as found in industry catalogs. Speaker is nice, but expensive.
Third brake light position important. Since the subhumans tailgate in every situation, having lamps up & above is worth consideration.
Same for conspicuity tape (some offerings are mono-color: Black-appearing with reflective yellow). Stick with highest grade 3M.
DOT has placement guidelines for lamps & reflective devices. The “logic” of patterns created should stand out. All sorts of vehicles.
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