I know this can vary from trailer brand/model, but in mine the battery feeds to 2 breakers (self resetting in mine) at the tongue area. One feeds to the main DC panel (the breaker serves as a "main" to the panel from the battery), and the other feeds the slideout. The tongue jack has it's own fuse in line and pulls power from the battery directly via one of those terminals as well. If yours is similar check to see that the breaker is self resetting. Not all of them are. If it's not, there is a small button on one side of the breaker that you push to reset. Beyond that, it's time to break out a meter and start following wires iMO.
Some of the newer models are putting the breakers inside the underbelly at the back of the front frame neat the tongue. Example from a 2020 build video:
Mine has a 50amp auto reset and my converter is a 55 amp converter. One time when the battery was very very low, when I plugged the trailer into shore power I could hear that self resetting DC breaker trip several times until the battery started to accept a charge (it was probably pulling the full 55 amps). It did that 3 or 4 times before it stopped. If your battery was low and your breaker/converter rating is similar that may be what tripped it. That "main" breaker is sized to protect the feed line, which in most trailers is 6ga. My breakers are visible on the outside of the frame at the tongue (near the battery).
Example of breaker with reset button on side.... It's the small black button on the left. Some are round, some are oval like this one. It may be hidden under a red cover on the terminals also.
Also you may want to look at this thread. There are some good photos of the locations of these breakers and more info (this is also where the photo above came from).
http://www.forestriverforums.com/for...et-154141.html