The intertubes show this is an Atwood model, and it appears is a single stage charger. The "made in china" sticker is a pretty strong indicator it's just a rebranded something else anyway. But there's nothing magical about it, pick out a nominal 45-55A multistage converter that fits in the spot you need it to, and down the road you go. Nothing says it has to be form or fit, as per Gary's comment it doesn't have to be in the same exact spot. I'm normally not one to arbitrarily replace components but in this case even if it was perfectly functional, a single stage charger can be unnecessarily hard to live with. Life is easer and battery health better with a multistage converter. This is like going from a 19" tube TV to a 32" smart flat screen.
Mark B.
Albuquerque, NM