Ha, they do look a bit overstuffed. Max pressure on each tire is 51psi and I'm not sure if the 18 in the pic is a front or a rear but it's either 46 or 28psi, depending on when end it came off of, per the door sticker. The 16s had just come out of the truck and been installed so I hadn't checked them yet but I found each one had between 30 and 35psi and I adjusted per the sticker. 46psi in the rears seems pretty high to me, and I don't quite understand the disparity between F&R however the handling of these trucks is certainly predictable enough. As expected, there was quite a difference between riding on the 18s versus the 16s. Not only is the diameter considerably smaller which lowers the truck a noticeable amount, the tread is a lot flatter on the Generals and it steers more like a car now. I hate it ;)

While digging up this pic just now I was scratching my head because I know 28PSI has been the front spec on the truck, and I just read it again on the door last night to confirm the pressure for the 16s. This pic says 30PSI in the front. The truck is an 03 and this is it's door jam sticker, however I swapped the door from the 04 to the 03 so it now has the 04's 28psi sticker on it. I can't imagine what the 2psi difference between 03 and 04 could possibly be related to.