IMO that is too much weight for the tailgate. I suspect overtime it will bend your hinges and ruin your tailgate. I have a 33x12.5r15 on a pro comp steel rim and I would have never considered having that much weight supported by the tailgate. Recommend you spring for a bumper mounted swing arm carrier, there are a lot of options out there. I went with the smittybuilt tubular model and it looks and works good. Better safe than sorry, good luck.