During normal operation, it should never put out max amperage. But this isn't about normal operation. There is no way Chevy would put a 50 amp alternator or higher in your stock truck due to the risk factor issue. It wouldn't cross their minds.
The maximum amperage that 50 amp maximum rated ammeter can stand without starting to glow is 50 amps. With the extra amperage having nowhere else to go, and it has to go somewhere, it will take the path of least resistance... perhaps a weak wire, or weak connection. It's just idiotic to sluff such a danger off as alarmist or something. Especially when precautions are out there and the solutions are very easy to deploy. Read the article on my website. I didn't say it because I was bored. Like everything else, it was very carefully written with experts from Powermaster on the phone making sure that everything is absolute irrefutable fact. There are other websites that talk about this issue too. Don't take my word for it, do your own research.