I never realized until looking at my photos after I posted earlier, you can literally see the bed flexing/bowing under the load....and that's a stout bed with a 6" steel C-channel / I-beam reinforced subframe...
During offload, the lift cylinders surprisingly didn't care, but the front axle came 18" off the ground when I dumped. After riding out that dump I ran the numbers and my face got a little tight when I saw the estimated load total. Wish I had a scale here to verify the exact weight.
I don't make a habit of overloading the truck that way. It was only 5 miles of field lanes and non-populated backroads though, so minimal risk and no rush.
*Edit* And this isn't meant as a brag. I HIGHLY do not recommend doing similar.
I grossly underestimated weight difference between downed white oak and live oak (the load pictured) as I have hauled numerous loads of 1yr+ downed white/red/pin oak of comparable size and always maintained within 1 ton of door tag rating. Only after the fact did I determine that I was nearly 3 ton overweight. Suffice to say, lesson learned to prevent repeat situation.
Ironically, this is precisely the reason I tagged the truck at 26k as well. Not as a goal, but as insurance should I eve get a tad too heavy. At least in the eyes of DOT and road taxes, I am alright.