Well,, if it helps,, I traded way up, from a half ton gas motor to a one ton diesel. Worked great for the family and towing. But the family grew up and started moving out so I went back to a Heavy Half (F150HD) then got a bigger trailer because I thought i had enough truck. I was right at the upper sweet spot of the F150, But it started wearing out fast so I am in a Sliverado 2500 HD gas 6.0 six speed long bed xtra cab 4x4! I am right where I need to be now and couldn't be more happy. My trailer is 6K loaded heavy and the 3/4 ton is perfect for what I need!!
Are you trading up? Or across? A Dmax for a Dmax is a Dmax. are you going 3/4 ton to one ton? I'd give my eye teeth for a Dmax but can't justify it!