YOu have two electrical systems on a trailer and 3 on a motor home
The "outlets" I am assuming are the 120 volt AC System. (House power like in a sticks and bricks)
The slides operate on a 12 volt DC (battery power) system usually the AUX or what i call "House" power.
The 3rd system on a motor home is teh "Truck" or chassis system. Involved with the VEHICLE side of a motor home. (Headlights. Engine, Tali. marker clearance stop turn, dash air, Dash radio and so on and so forth the "Truck" systems)
So for both to fail at once...
Unless there is a spot where both 120 and 12 volt wires cross over something and they have been cut... Not likely they are connected. and yes. often those wires do travel together. BUT NOT to the slide out motor.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times