Floyd Mayweather's pricey car collection took a massive hit this week -- when a trailer transporting Floyd's Bentley and 2 Rolls Royce whips burned down to the ground ... TMZ Sports has learned.
We're told the truck was transporting Floyd's rides from Vegas to Miami when something went wrong just outside of Phoenix, Arizona on October 7th at 1:31 AM ... and the entire unit went up in flames.
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