Wheel offset plays a critical role in steering 'weight' too.

I experienced this with an O/T car I bought a few years ago,it had those hideous white 8 spoke wheels on it and it was like driving a tank.
I changed the wheels to a slightly narrower wheel 6" rather than 7" but with the correct offset and the difference was impressive to say the least.

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.