your roof is probably an open frame construction, so it would be pretty easy to reach up and grab power from those wires. The interior baffle is held up by 4 screws, easy to pull it down and take a peak up to see if those wires are close by.
Like I said, the fan only takes 3 amps, most fixtures pull close to that with both lights on. replacing the vent was not nearly as hard as I thought it would be.
2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC
A rainy day camping is better than a sunny day at work.