Cool ride!
Those are Denali wheels (model CK375) from the same generation of truck. They are really popular and there are plenty of OEM and aftermarket replacements available if you wanna keep the style. But, both OEM and aftermarket versions are known for the chrome pitting and flaking off if you drive in the salt. It's wheels on a 6-lug GM vehicle- the options for OEM, aftermarket, chrome, painted, powdercoated, are almost limitless. As for aftermarket, I forget which has (or had) the best warranty- OE Wheels or Factory Reproductions.