well i got my Summit UD pulley kit installed this weekend!! I took some pics of the pulleys next to the stock ones and when i go to post this i see i took a pic of the wrong side of the pulley!!!. The install went smooth until i went to start the truck with the stock belt on, I should have looked at the belt tension before i started up the truck and i would have seen it was bottomed out. I went to the parts store and got a 1 inch shorter belt and vualaa install complete. It was around 90 deg outside as i live in south Texas, pulled a trailer with 4 6x8 ft deer blinds with my truck on the canned tow tune and it never went above 196 deg (2hr drive). I let my truck idle for about 20 min at times cruzing around the ranch and it never got above 196 deg. As far as the charging system I have a red top batt. DVD screens/ 2 12inch subs/ 3 sets of HID's/tuner/ and Sirius radio all running at the same time and had no problems with the volt going to low it went down to about 13.6 but would go between that and 13.9 once i hit the gas it goes up to the normal 14.3 14.2 I set my idle speed +70. I think it was on here the MAD doc said that it would help to bump up the idle. Anyhow sorry for the long post I just wanted to let everyone know this has not been a bad upgrade for me so far!!!