I may be wrong but I don't believe the 25' FC has a 12V
mode refrigerator. If it is like my 2018 It requires 12V
to power the logic, controls and light. So on the road we keep the propane open and refrigerator in auto so it switches to propane and stays cold while traveling. Some states prohibit driving with the propane system active....
On the road the leveling issue does not apply, the jostling keeps the refrigerant from pooling. When stopped for more than an hour or so it does need to be level.
If you happen to have 12V mode refrigerator, I would consider using 12V mode. It will prevent your trailer batteries from fully charging while driving and if fully charged, they will drain a bit as the vehicle voltage and losses in the wires to the trailer is insufficient to keep it charged. It won't drop below about 80-85% so if you don't plan to boondock it might be fine. If you want to correct this issue, you can get a DC to DC charger/converter to boost the voltage so the battery will stay fully charged.