There's that one Ferd on the interwebs with the buckled frame with the big TC and trailer on the back, don't buy that one! Any other truck should be fine....
Seriously, the old ford frames aren't weak they,re just not as stiff. Buy the truck you like, not the frame.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold