That is a lot for $175k miles and it likely lacks a warranty. Also, the plow adds a premium and may be worth more than ghe Tahoe withoutthe plow! At this mileage, if the transmission hasn't been rebuilt yet, it will likely need a rebuild. Also, the 5.3 liter engine will start burning oil and need a ring job if it hasn't happened yet. And expect 12 to 14 mpg around town and 16 to 18 on the highway, depending on the axle ratio, so it is expensive to operate.