Quick question regarding the 3 trims available for the Tahoe or Yukon. Without having to add or replace components with aftermarket parts, which trim level or specs available for each trim make the vehicle most capable in offroad? For example, I noticed the premier trim comes with 20" wheels, but would it not be better to have the 18" wheels that come standard on the LS and LT trim levels? Also, how about the gear ratio, 3.08 or 3.42?