1994 Maristar Trailer Brakes

I have a 1994 Maristar 225 with the factory trailer and it needs new brakes. It currently has the original drum brakes and I would like to convert to disc brakes. Could someone please give me a recommendation on new disc brakes? This is the first set of trailer brakes I've done and want to make sure I order the right setup, which is hard when you can't see what you are buying. I've done plenty of car brakes however.

Let me know what else I need to provide for info and many thanks in advance.