Unless they've changed things since I bought mine, that F250 will have a GVWR of 8800#. With a diesel it will weigh in at 6500# minimum. That means you can put 2,300# on the kingpin or goosneck ball without busting your GVWR. That means about 10,000# total trailer weight. Interestingly, you can usually go a little higher using a "regular" trailer with weight distribution before you bust the GCVWR.