I think Rick is right.
The Journey SE (basic model) is equiped with 16" Hankook tires. Hankook DYNAPRO 225/70 r16
Larry, 255/70 would be the appropriate size for the winter tires on 16" wheels on the SXT and R/T.
Logically, i don't think the brake size should be a concern on the SXT and R/T with 16" wheels.
With ordinary steel wheels and winter tires, you will preserve your Alu Wheels and $$$winter tires. I did the same thing to preserve my Dodge Grand Caravan mag wheels.
As for the road hazard, my dealer told me it's not covered by the warranty The hasard was on the tire sidewall...
For more info go to : http://www.kumhotire.ca/tirebasics/warranty_information.php
I'll keep you guys informed
Ben