I used I believe 10 gauge romex. The vent already has 12vt wires for a fan. Used those wires to pull the romex through the ceiling into the cabinet over the bed.
In my mh all the electrical stuff is under the bed. So I ran the romex through a wall down to under the bed. Then out through the floor with all the other wires. I connected the wires to a 30 amp plug.
I get a 50 amp campsite. Use a 50 to two 30 amp adapter to connect at the pedestal
Jerry