Truck / 5th Wheel Combo - Do the numbers add up?

Without talking about all the numbers, ratios, GVW, etc. We towed our heavy FW (in sig) which is close to 14k fully loaded first with an F250, SRW, short bed. Big mistake. We added air bags to the pickup and they kept failing. We traded it in for an F350, long bed, dually and what a difference in towing. No sway, no wobble, just a solid ride! I would highly recommend a long bed for any heavy FW towing.