Take it from a farmer- you are always better off buying a vehicle (or piece of equipment) that is made to handle a load in its base form than a lighter duty vehicle “ beefed up “ to handle the same load.
The 150 may have overload springs, but the 3/4 ton usually has bigger brakes, bigger rims & higher weight rating tires, heavier frame, larger axles, bigger torque converter, bigger steering box and front end components and probably a heavier duty engine.
I constantly hear guys bragging up these small displacement engines as having the same HP as a bigger 5.3L or 6L GM gas engine. The smaller Ford eco boost engines are nice and economical, but they don’t have the rotating mass of the bigger, heavier engines. They’re not built to take the rigors of hauling heavy loads. Then there’s the stopping power aspect. A 5,000lb 1/2 ton truck will not stop a load as well as a 3/4 ton 6,500lb truck.
Compromise elsewhere