Answer to your question is Yes That is why I don't pay any attention to all the other "blather" And I already got rid of the black water tank and now have a residential toilet and residential r...
For the record, assuming your trailer is newer than 1990s, you CAN operate the converter without a battery attached, just tape up the connections that were connected to the battery. The switching converters do not need a battery.
But it IS your trailer and if you want to replace the 12V stuff, it is your choice, you don't need others in this forum to push you into not making the changes you want to do.