I have a CC F350(in sig) and needed ways to carry our new kayaks. After all of the searching, this is the best we came up with. A hitch on the front of the truck and either the Thule Goal Post Rack with a set of roof racks or a Rhino T-Loader rack with roof racks. Like these.
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'