Thanks for the input, folks. I'm quite sure I can get where I am going with the stock Wrangler HPs on the 20" factory chrome rims.
I should have been more specific. My objectives are to to dramatically IMPROVE winter driving traction, and also take the chromes off to spare them from the brutality of winter road conditions and the chemicals applied to the roads here in Upstate NY.
For example, on my '06 2500 Cummins Ram, I replaced the stock Michelien LTXs with Cooper Discover ATRs when the Michelins wore out. The Coopers have a more open pattern, and the truck went much, miuch better in wet snow and the type of mud and slop I occasionally encounter when field hunting for geese, which calls for driving on wet, rutted field laneways.
I found some factory 18s on CL, brand new takeoffs, but the guy is asking $500 per, and I don't know (yet) if that is with the TPMS sensors. Sounds a little steep.