I know you're looking at the baby duramax, but when I ask users on here about a full size truck, they pointed me towards a Nissan Titan. It's more like a 5/8ths truck.... big interior, but not quite a massive hauler. After reason and doing some digging, I considered a 2017, almost fully loaded, they go for about $40,000. But just like all new designs, it will have its bugs and quirks, so get the warranty.

hope that helps