Here's an inside shot of the 7 connector junction box on the tongue.. note the 4 pin to 4 pin connector. I added a few wire looms to help protect the wires abit.

Heres the inside 12v lead(s) revised abit.. comes in lower @ about 20" (for a BlueSea 12v fuse block) then goes upto 50" for a 12v switch for the waterpump (using a 15amp house single pole switch and a shallow 'old' work box thats surface mount).. then a 12v+ lead comes back down behind wall again to floor for the actual water pump.

The wire @ 50" will continue up and over (behind the wall) to the side wall and side wall interior light the trailer came with.. I temporarily butt connected the wires and zip tied together for now.