I bought my 2008 Road King at Longhorn Harley-Davidson. It would seem like a Harley-Davidson Dealer would go through and check the bikes that are traded in before they put them out for sale. Before I bought mine, they told me that it had a Smart Security System installed in it, they explained how the security system worked, and even handed me a Security System fob with the keys. After purchasing the bike I checking the bike out thoroughly, I found a broken saddle bag lock, broken Ignition knob, worn compensator bushings on the rear drive sprocket, no grease in the steering head bearings, the oil in the engine had not been changed, worn brake pads, and that there was no Smart System Security Module installed on the bike. Although they repaired the saddle bag lock, replaced the ignition knob, and replaced the compensator bushings. They refused to install a Smart Security System in it that played a big part in me purchasing the bike. I had to change the engine oil, brake pads, and greased and adjust the steering head bearings.
If you plan to buy a used bike form these guys. Take it to a real motorcycle service department and have it checked out before buying.