Why hasn't anyone released a HD truck with a Turbo V8?

I don't believe CAFE standards apply to 3/4 and bigger trucks.

As for a turbo in an HD truck, I would wonder about the longevity of something like that, especially in a smaller motor. While the 3.5L EB is by all accounts a great motor, can it hold up pulling heavy loads on a regular basis for 200,000+ miles in a 3/4 ton commercially used truck?