I have a 2007 3500 SRW and tow 14K 5vr. Wet pin is 2950#.....no bags
I would wait until you hookup 'camp ready' (all the people/stuff etc.) and see how it sits/tows. May need to make hitch/pin box adjustments.
Then go across some scales and get real world weights.
That 2015 F350 SRW should handle a 15,000 GVWR trailer just fine.
Remember.....FT is about easy/laid back traveling (not vacation mode) and Less is More' (just because you have room/spot for something doesn't mean you have to fill it) 1 bag in/2 bags out :B