$4000? I once bought a new car for $4000, okay but yes somewhere back in the long ago.
Okay, GL1800 has a "Lincoln Town Car" suspension (I assume on purpose). It will wallow in turns at high speed and if there are serious bumps in the turn you might have an issue. I heard it referred to as "sporty" and that it can keep up with Sportbikes. This is complete nonsense. It lacks the power, suspension, ground clearance. On my rare rides in the canyon sporty riders pass me on the outside doing a wheelie.
That being said I think it is as close to perfect as any machine ever built. Not perfect but as close as anyone has come. I don't care about carving the canyon (I used to and I had Duc on which to do it). I care about smooth highway miles, comfotable seat, wind protection, plenty of top-gear roll-on power, RELIABILITY, low maintenance, luggage capacity, big-ass alternator, cruise control that really works.