I have a 1997 Hitchhiker II fifth wheel that has the original water heater (Atwood GC6AA-9E) and I need to replace it. Does anyone know a good replacement for it and where I can get it? I have seen prices for new water heaters ranging anywhere from $400 to $650. I would like the cost be toward the lower end. I am planning to change it out myself; any advice would be appreciated. Thanks.