I'll post some real world thoughts....we have the exact same 5th wheel. I originally was towing it with a 2011 F350 SRW diesel. It towed just fine in my opinion....until I started reading about the true numbers and the posts regarding the legal responsibility in the event of any type of accident. Then I starting reading all of the fine print regarding tongue weight, payload, tow capacity, etc.....I came to the conclusion that as much as I liked my truck, in the regards of payload, I was over the limit. No way to get around that. Yes, I'm a careful slow driver.....but there are a lot of folks on the highways that aren't. The idea of having to deal with a true nightmare bothered me.......I started looking around at Ford duallys knowing that having the extra set of rear wheels and the additional payload would be nothing but a benefit. I ended up finding an immaculate 2011 F450 dually at a small dealership in No Cal. We ended up making a deal, he drove it down to me and drove my 350 back up north. I have never had a regret with the trade. The peace of mind is worth everything. And I love the truck.
At the end of the day, you have to decide if you can live with any and all of the potential legal ramifications of any choice you make....and the peace of mind whenever you take your rig out.
And just so you know....we absolutely love our Cougar. It's our forever trailer.