Love my 09 GM 6.0, just to add, some of our newer rescues are coming with the GM 6.0 instead of diesel. The one that I saw yesterday has 102K on it, hard rescue driven miles and no issues. Yes its carrying an ambulance box so it has seen some hard times for sure. Check out all 3 and see what fits your wallet and personal taste. I feel that all 3 manufactures make good gas rigs. I know that you can purchase EFI live tunes for both Ford and Chevy, but I don't know about any support for the Dodge yet. Ford updated the 6.2 this year, and GM is probably updating the 6.0 in 2019. The Dodge 6.4 has a tranny quirk from what TFL says, but Im sure you can shift it manually and get the power that you paid for. Dodge got a nice looking interior and Ford 2018 has a new truck altogether. GM will be changing up soon I think, but the current 6.0 is a proven power house.