Bingo, thanks for the photo.
Eliyahu is this your manual?
https://www.airstream.com/wp-content...tional2008.pdf
The Electric Section G starts on p. G-1 [PDF p. 76/99] where it says:
"All 12-volt current comes through the battery system in the front of your trailer. The battery is accessible in the battery box on the A-frame of your trailer. Power from the battery goes to a set of four Type 2 thermal breakers located under the front bed and riveted to the inside skin front plate. The breakers are ties together by a brass bus bar. One breaker (30 Amp.) protects the 12-volt tow vehicle charge line coming from the 7-way cord. Another breaker (20 Amp.) feeds the trailer brakes breakaway switch located near the hitch coupler. A 50 amp. breaker feeds the Battery Disconnect relay. The current leaves the relay and goes to the 12-volt distribution panel located in the converter and then to the rest of the trailer. Open the brown decorative door on the front of the converter under the dinette to access the panel and its fuses. A 12-volt layout diagram is shown later in this section."
On p. G-4 [PDF p. 79]:
"If any 12-volt appliance fails to operate, first check your recreational vehicles 12-volt distribution fuse block located behind the decorative front door in the front right hand corner of the converter and inspect all fuses."
Not sure this covers your floor plan and configuration, as the manual covers a variety of International lengths and models.
Good luck,
Peter