I hate be negative, but if it were my rig I'd try to find something with a higher working temp. At times, 200 degrees is not far off from actual engine bay temps. Working the truck hard in stop and go traffic is summer heat would bring the engine bay temps up to well over 100 degrees, and I'd hate to have the cap get drawn into the turbo.
That's just my opinion, so take it FWIW. I would have just skipped over posting in this thread instead of making a negative post, had I not wondered about how many others had already chosen to do just that.