Truck camper electric jack pre wiring

Fuse should be located pretty close to battery, ours are small metal breakers attached to floor just behind battery box. However as its a pre-wire wires may not have been run that far and terminate there. Might be coiled anywhere if fuse or resettable breaker not also installed. Possibly (with a tether in case you drop) stick a camera back in look around. Though I would assume easy to gain access, I wouldnt assume actually connected-but test. Forward water tank box? Worst case I can think is plugs installed but wire not run. Might pull one-to verify wire extended, ours used crimp-on terminals, plug leads fairly short.