So, we are supposed to believe you over someone who works on them everyday?:doh:
I like how people who have owned one or two know more than a reputable vendor does. Don't expect Golfer to be back in here, the only thought I have on what Dave said is that I think, but I'm not certain, that there are a lot of 6leakers compared to 6.4L's, but as much fun as it would be to buy a 6.4 delete it, add a tune and gain 300hp I couldn't chance a motor failure with my wallet.
On a second note, I just bought a 2004 Jayco 30' fith wheel, it grosses out at 8k, I think the only way your going to be at 15k is with a toy hauler loaded.