Honestly man I love it! Ya the duramax was sweet especially with 100%s, 10mm cp3 and the s369sxe. It literally took 20k though to get 700hp lol. 5k in a 6.2 and you will be running just as fast as a 700hp cc dmax. I live up north and was just sick of gelling issues, additive etc.
I own my own construction business installing tile showers etc and wood floors. I have a 7x16 cargo and a 7x14 dump trailer. I had the dump trailer loaded at 8500lbs and my 6.2 towed it great. Plenty of power and braked just fine especially with trailer brakes.
Only thing im going to do is throw some sumo springs on rear and possibly coil overs up front. When loaded heavy it can really want to bounce, front end included. I jacked my stock duratracs up to 50 psi and that helped with sway a ton. I knew the only sway I was getting was from my tires. They are 18”s with duratracs which I’ve read have really soft sidewalls even on the 10 plys. This summer I’m buying wheels and ridge grapplers so I’m sure that will make it even better.
So so far though the 6.2 amazes me, apparently guys are running high 13s all stock crew cabs with 6.2. Once you get her wound up she pulls hard, my plan is long tubes and a e85 sensor and tune. Those 2 mods alone guys are gaining 80-90hp to the wheels. Be a good 420ish whp after tune and headers. At 5500lbs also vs the 7500 of a duramax. I’ll bet tune and headers could keep up with a built trans max effort dmax all day.