Man, I have not seen a converter like that since the ORIGINAL 3 amp Progressive Dynamics I had in a PUP..
As I said, I would put in a good one,, Something from Progressive Dynamics.
WHY: Well if you keep the trailer 3 years the new converter will pay for itself in batteries you DO NOT replace.. that's why.
Given a Progressive 9180 with Wizard (The Wiz is important) my factory Interstates made it to 9 years and I made a few "OOPS" type mistakes along the way.. I hope to hit a full decade with their replacements.