Is this a duel rear wheel. In that case I wouldn't think twice. I drive a 2011 D/A LB extended cab SRW. I presently have a 12k 5th wheel. If I wanted to get a 5th wheel of your size I still would be comfortable with my truck. I think it would handle that rig just fine. I have even thought about buying a bigger rig and 15K was what I was thinking would be my max I would consider. My 12k 5th wheel has been hauled through the Rockies and thousands of miles and has handled great. The exhaust brake and the overall suspension upgrade of the 2011's made a big big difference.