Smaller wheels than 20s

Hey Guys,I originally bought my Jeep to use for work and Im ready to start using it in the next few weeks. In my line of work I drive on dirt roads and up mountains. Other than the nose on the front end, my Jeep probably has about the same ground clearance as my Ridgeline did. I want to put on a set of all terrain tires, well I have zero options as far as using the 20s.Actually Ihave thought about using Proxies but Im sure in a couple weeks I will have chunks missing from the garvel/dirt roads. Can somebody refer me to a link or something that will tell me what the smallest rim is that will clear the Brembos. If I can fit a 18, I think I can find a set of tires that would be better for my needs.

Thanks

BTW- I did a couple of searches and came up flat, things change over time and I figured some of you veteran SRT8 owners might have better insight.

 

Thanks Dustin, A nightmare I dont want but Im still looking at all options. Somedays I drive over 200 miles@ 60-70MPH on a gravel road, now in the Jeep I wont drive that fast but will be on gravel roads none the less. I guess a couple pair of Proxies a year is still cheaper than both rims and tires, I just dont think proxies are going to be worth a crap in mud.