Backspace and offset of wheels can also play an important part too, the relation of the wheel centre line to the king pins.
Especially on a non power steering set-up.

A 225 width tyre is not a huge width for a truck. A 70 series profile on a 225 gives you more than a 6" sidewall which is still pretty tall.

A few years back I had an old GM Vauxhall Cresta.
The P.O. had put those awful white 8 spokes that look more at home on a Baja Bug and the offset was all wrong.

I changed the wheels to a wheel better suited to the car(same width as the 8 spokes but different offset) and it was like magic,no hauling at the steering wheel to turn!


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.