There are many advantages of having a fifth wheel trailer. But the biggest disadvantage is in travelling long distances. With a family of five plus a dog any tow vehicle is going to be crowded. A class A is going to allow everyone to spread out a little and not get cramped up. Plus not having to stop for on of the family members to use the bathroom is a plus. A diesel though more costly to operate will have a nicer ride with it's air suspension, air brakes, and having the engine in the rear away from where you are sitting. It makes for a nicer riding experience. I'm sure other will have ideas for you but that's my take. BTW 6 speed transmission!
Tony & Ruth........... FMCA#F416727
Newmar Dutch Star 4320, Spartan MM Chassis, Cat C9, Jeep Grand Cherokee,with Hemi, hooked up with a Blue Ox Aventa LX, and Brake Buddy.