zcookiemonstar - You are correct, 1600 lbs over the GVWR and not the axle ratings.
~DJ~ - Personally, I have no problem with overloading an HD truck or a half ton. I have overloaded both in the past, and would in the future. I would not overload a half ton as much as I would a HD. My primary concern is the semi-floating axles and the axle bearings in the half ton. On the "missed in my owners manual for my F 150 that I could only carry a load "occasionally"", it was probably on a small card in the glove box that the sales people removed. They can't put everything in the manual. :B :R
mkirsch - My concern is with the axles and axle bearings. The suspension can be easily modified. On some half tons, you can get heavy duty axles, or even have them made, but the basic design is still the same, semi-floating axles. If the axle breaks you are out of control, and on the ground. A bearing failure can be the cause. With floating axles, you can literately pull the axle out, and still roll down the highway. If you burn up a bearing, it may very well stop the wheel from turning, but it will not break and drop the axle on the ground.
hedgehopper - I need not make up the numbers, they would serve no useful purpose. On this subject, I do not even need to cite what I have read, I am speaking of my personal experience. As for the MPG, be it a gas or diesel, it makes no sense that my Dodge 2500 with TC (10,400 lbs) gets 12 MPG, and the Toyota (4200 lbs) gets 14 MPG. I guess you could improve the efficiency of the Toyota with a diesel. I really like the Toyota, but it has its weak points.
In years past, I have had half tons with TCs. I am sure they were overloaded, but I never personally had a problem. I had friends that did have problems with axles and or axle bearings, and they were scary. I do not know where someone should draw the line with being overweight. I guess that will just be a decision they will have to make. We can only cite our experiences.
Which vehicle is best? You can argue forever, and I doubt you could really prove which one is the best. I have had some vehicles I like better than others, but I question I have ever had the "best".
Wayne