Kayteg1 wrote:
The highest rating for truck tires I found was about 3000 lb.
So unless you go to 19.5", you will have 6000 rear axle rating minus 3000 truck weight leaves 3000lb rear cargo for SRW.
Add 2 more wheels and you have 9000 lb rear cargo (with slight adjustment for bigger DRW weight)
Adjust the numbers to your actual truck, but the final will not change much.
You are pretty far off on SRWs 18s go all of the way to 4080. Stock Fords are 3760.
With a DRW tires no longer are the limiter. The axle rating is. However, not all trucks list RAWR.
Still, a trip to the scale for actual weights is the way to go.