Hi... just purchased 2018 F350, SRW, diesel, 6 3/4 bed with 3385 avail for cargo. Charts a little confusing. Want to make sure I can pull 14000 fifth wheel with room to spare. Planning on driving around country. I believe the charts say I can pull 18000, and I figure the pin weight would take 2100-2600# from the 3385 available. Thanks in advance .