The 2013 2500 has a GVWR of 10,000# The truck with you, wife, fuel, hitch, etc is probably 7,500-8,000# as someone else recently found out. The trailer your looking at is about 11,500# empty which means loaded around 13,000# at 20% that's a 2,600# pin weight. You might want to look at the 3500 series truck instead.
Ram Truck websiteThe trucks can pull more than they can carry and pin weight is always the gotcha in the deal. Average 5er pin weight is 20-25% of trailers actual weight. Not uncommon for people to add 1,000 to 1,500# of stuff to their trailer.
The 2012 Forest River Sierra 345RET has a rounded aerodynamic nose which helps with you turning radius. The standard bed appears to be 6'4" so you're probably ok with a short bed. I prefer the long bed so I can put stuff between the cab and the hitch like coolers and toolbox/aux fuel tank in future.
2012 Sundance 3100RB w/Reese Goose Box
2004 Ford F350 6.0 L PSD, CC, DRW, long bed, B&W drop ball hitch, Firestone Ride-rite air bags.