Equally important - rotate your mud tires. I learned the hard way that you need to rotate. If you don't, the fronts will get a very wacky cupping style tread wear. Others have seen this as well and have posted this on here.

 

Always go with the door. Everything else is just personal preference

 

Always go with a chalk test to determine correct tire pressure. Door rating is safe, but is based on full GVWR and a JKU will have a wider swing from empty to full GVWR than a 2 door. So with testing you'll have one set of tire pressures for an empty jeep with just a driver and another for fully loaded up with gear and 4 adults. On my LJ this a 2# swing. It's been too wet here for me to test my new JKUR yet.

 

Actually, the 255/70-18 (32.2") Bridgestone Duellers on my 2007 EL are rated for 2469lbs @ 44psi compared to the 255/75-17's (32.1") KM's on my 2010 Rubicon which are rated 2405lbs @ 50psi. Not a significant amount of difference between the tires considering there is about 1 ton of difference in the vehicles, empty weight. Yeah, IMO the tire pressure ratings are goofy...

This topic can be beat to death, ad nauseam. I run what my vehicle and I like. Other's mileage will vary.

BF Goodrich used to have a chart they kept online that showed the load rating of the tire base on the amount of air pressure in the tire. Unfortunately I think it has been removed but when I was towing, I weighed my axles and went by this chart and my trucks rode like butter and tires wore perfectly. I think I still have a print out of this chart at work somewhere and if I can find it, I'll scan and post. I guess if one wanted to buy the TRA (Tire and Rim Association) yearbook for about $85.00, you could get the published load ratings based on PSI for whatever tire you wanted.