Welcome to the forum. Most are located around the dining room table area around the bench seat. You can trace the wiring from the battery back and it should lead you right to the fuses.
I have an 82 my fuses for 12 volt are in the inverter. There is a cover over them. They are under the right hand dinette cushion. My breakers for 120 volts are under the sink.
The breakers and fuses could be anywhere. Look at any place that could be a storage area, like under the dinette, the couch, or bed. Different models placed them in different places. I always looked close to where the shore power entered the trailer.
i have an 83. my braker box is on the bottom of the draws under the counter next to the sink. you have 3 draws and the 4th draw is actually a cabinet where your braker box is.