Pulling a Fifth Wheel problem, worried about my Dad...

I also vote dually. I've had 3 TVs with 5 5ers and the only combo that wasn't rock solid was when we went from a 25' 5er to a 31' 9600 gvw 5er and I still had a 3/4 T. Even at 80 psi in the tires and airbags, it felt like a rocking boat and It was very noticeably affected by passing trucks. Went to the dually and it was absolutely rock solid again. In fact, it's just as solid with our current 15k gvw 5er and I only run 55 psi in the rear. Craig