new truck advice

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Thanks for all the response. sorry I didn't respond faster I didn't see anybody had responded then I gave up. so, to answer one of the questions I’m usually am around 95,000 And I agree gear ratio has a major effect I currently have a 378 Gear ratio 10 speed Mercedes engine no Jake brake. hence the real reason why Jake brake is on my mind! wondering which engine has the strongest Jake brake. One if the trucks I’m looking at does have a 13 speed in it 355 gear ratio dd15 505 hp. And yes, working on your own truck is the only way to go. Taking my truck in to a shop would have put me out of business right after I started. I don’t relied on shops not only for the money but also the time that it takes them to do a repair. I can usually do a repair overnight and be back on the road in the morning or on the weekends. I appreciate the info on The Commons having support for that engine direct from the manufacturer is awesome Does anybody know of a forum that works with a DD 15?