Had the same problem with mine, I have hydraulic slides. The breaker should be an automatic reset type and would be close to the battery as possible. Could be 3 things wrong with. 1) bad pump motor drawing to many amps 2) bad breaker, tripping before itís supposed to 3) batteries are bad/to low on power. Mine was a bad breaker, got a new one for $8 and good to go. Start with that, itís the cheapest. Also does it trip only on battery power or does trip also on shore power?
Sorry for the long delay, didn’t realize you replied. Breaker would be close to battery. Mine is located in the front left compartment right above battery. Follow the red 4ga wires to locate. Do you know what a automatic reset automotive breaker looks like? My camper is still in storage, so can’t send pictures for a week or two.
The breaker is most likely mounted to the sidewall on a bus bar in front compartment under pinbox. I, under direction from FR, installed a heavier breaker and solved my issue. I believe I went to a 40amp breaker, but can't be certain.