JIMNLIN wrote:
JMO..... but 19.5" tires/wheels and are a commercial service combo made to go the distance at max loads all day and nite long. They will have a shorter sidewall which eliminates carcass roll when properly inflated.
They also can have a G or H load rating 110 psi and comes on our 4500/5500 size trucks. A tall heavy truck camper will benefit from a tire like this. These tires may run twice (or more) as many miles of service than the 18" E tire.
OEM 18"/20" comes up to a load E at 80 psi and do a good job for 2500/3500 pickups with 6k-7k RAWR. They can be a little soft for 4k-6k loads in the bed.
Yeah. I had my F450 on 19.5 wheels grossing over 20,000 lb more than once. Don't try that on 18"
It is like comparing diesel to gasoline engine.
Both do the same job, but on quite different level.