The bed length on my '11 F250 short bed is 6'-9". I'm buying a 2014 Bighorn 3010RE that promotes an 88deg turn radius. 5'er has a pinbox. Do I need a slider hitch? If not, what hitch is recommended? Dealer wants to charge me $1500 for a slider I think I don't need. Confused about, single pivot, double pivot, etc.