Pull the left brake/signal bulb out and try again. Could be the filaments are crossed inside the bulb giving you X feed into the park lights and overloading the flasher . That wouldn't explain the centre brake though.
Most times the centre brake is direct wired to the brake light switch.
Another place to check is the trailer wiring connector , open it right up and look for loose wiring , corrosion.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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