Roxor Roof Mount Air Conditioning A/C & add an alternator kitThis kit includes an add on Alternator Kit, with brackets for easy install. We do not have instructions made up to go with it, it's that easy. You will need to cut your roof for fitment, we installed ours on a Hardcabs and it works flawlessly. We have Not installed on any other cab, you will have to try it for yourself on any other cab besides a Hardcabs. In the shop on low, we had below 40* temps, outside in 80+* temps, we had 43* coming out of the