On my previous gm (gas) trucks I had tow/haul buttons. My new 2022.5, 1/2 ton RST with max tow package, 3.73 gear, 3.0 duramax has no tow/haul button per say, just a "engine brake" (LOL) with the "tow/haul" symbol on it. Doesn't seem to change the shift pattern accelerating or decelerating when...