I just bought essentially the same truck last week...silver 2017 LTZ w/ 2LZ, but am just in the planning stages on mods. It has the OEM power retractable running boards, which I'll probably keep as I can't justify the expense of aftermarket retractables when I already have a pair that get close. Mild lift/level and bigger wheels and tires planned, same basic concept as you... I'm thinking something like 1" rear, 2.5" front (a little lift, a little level, and a little remaining rake) and maybe 33" tires on 20" wheels if I can safely make that work. Also deleting the front lip and replacing with a plate for clearance, clear bra the front end, improve the exhaust note, and maybe blackout the handles, rub rails, and hood insets.