The best source for information on Boer POWs that I know of is the website of the Anglo-Boer War Museum. It has an extensive searchable database, which searches multiple fields (including prisoner name, address, date of capture, where captured, etc.). You can find the database here:
I did a quick search for “Trent”, but I’m afraid I wasn’t able to find anything. However, it might still be worth having a look, perhaps trying some variations on the surname. Also, you might try to contact a researcher at the museum – I don’t know what sort of advice or services they offer, and therefore whether they would be able to help you, but the contact email for general research queries is [email protected]
I also had a quick look at the details of some of the members of the Boer League of Veterans from the Ermelo district, and a few I could find from Amsterdam in particular (info on members of the League are available on the same database). As far as I could ascertain from this very quick, very superficial search, if Trent joined his local commando, he may well have served under Hans Grobler or Izak Greyling, if that’s any help. However, that is by no means certain – as I said, I make this inference from only a cursory search, and I have no expert knowledge in this area. I mention it only as a potential thread to follow – probably best to check with someone at the museum (or someone more knowledgeable than I on this site)!
Good luck with your search!