I guess you missed the 2wd part.
Nope, my SLT has 8" wheels. And 305s will be fine. My 315s are wearing perfectly with 43K on them.I thought there was a difference in rim width between SLT and Laramie trim levels... .
I think the SLT is 7. 5 inch, the Laramie is 8 inch... At least, thats what I think. . maybe someone will chime in here?