Wow, $6500 is cheap! I'd be on the edge to sell mine for another 10k on top of that, and it's an '06.
So mine has the electric jacks and if I swapped over to manual, there is really no way that you could mask where the wiring comes through the wall, so I think that if it ever had electric jacks or if it's wired you could easily tell. Take a look in the plumbing door on the driver side rear compartment and you should see the wiring.
Like others have said, take a look around the bathroom skylight, front roof seam and front clearance lights...I haven't experienced any leaks on mine.