Truck hauling heavy equipment uphill fails - GIF

[Frank S]

Yes they needed to have the fifth wheel slid forward a couple notches where it as set might have had the perfect weight distribution to cross the scales but in long hard pulls where you are in the bottom gear there is enough torque on the larger engines to not only lift the left front steer tire but to permanently twist the frame.
sliding the fifth wheel a couple notches too far forward elevates a lot of the problem. once you find yourself in the bottom gear you don't let off until the top find the best torque RPM and stay there not more not less if you even let all the way up and gas on it again the driveline or a rear end the transmission or an axle is going to break every time. Always have the power divider locked in and if you have it the interaxle lock don't worry about gear bind there will be enough tire slippage to compensate for a short duration of a few miles.
Once a load such as this starts down hill even setting every brake on the rig is not going to stop it if the tires lock up. I've seen ruts cut into the asphalt from trying to stop going backwards.