We are ordering our F350, Diesel, SRW, 4x4 to pull a Solitude 305RE. One Ford dealer says get the biggest tires you can (he recommended 20" wheels & 20" Tires). A second Ford dealers says to stay with the 18" wheels and tires.

They seem to differ on whether it is more important for heavy towing to have larger tire circumference which would mean a smaller height from the rim to the tread or a smaller circumference but taller height from rim to tread.

Would appreciate anyone's knowleage especially anyone with an F350, SRW, 4x4.

Also if you have a 4x4 truck are you running the standard tire, regardless of size, or the 4x4 tread?

Thanks, Tigerbug