Hmmmmmmmmmmmmmm.
My experience is that overloaded trucks handle exceptionally poorly. And no amount of suspension upgrades really help.
Here's some real numbers for you to consider:
My 2010 F150 weighs 6000 empty.
The GVWR is 7200 to 7700 (a heavy duty tow package, shock and spring, upgrades the GVWR. I added Bilsteins and Timbrens).
Jayco Dry weight 1200 pounds.
Loaded Jayco..... 1600 to 1800 depending on passengers and gear.
I was right at my GVWR, and it drove okay. Rear axle was at max rating too. Would I go over? NO!
