Howdy Iggy,
I don't remember that the cam was a trouble spot for the 280. If you trust the dealer to fix it right then that shouldn't be a problem. If you notice a vibration it might be from the U joints or it could be a bent driveshaft but make sure they are fixed. Check for rust behind each tire in the wheel wells. The 280G didn't have all the electronics that later models had so that helps keep the electrical problems down. With so few miles on it it sounds like you will get a good one.

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Frank X. Morris
17 Kia Niro
08 Jeep Wrangler 4 door unlimited