[Cadak]

Hello I am currently looking a diesel truck but am on the edge of whether getting what seems like a well maintained 6.0 (already has bullet proof egr cooler) or a 5.9 cummings. I will be using the truck as daily driver Monday thru Friday as a dd for around 20 miles and then on weekends haul a boat that is about ~6,000 lbs.my question begins with does the egr cooler alone help the 6.0 be reliable or do I need more parts. And also I have heard that the 6.0 needs to be somewhat "abused" to avoid any problems. Sorry for the noob question, any help would be appreciated thanks.