Funny you mention that, I brought the side car issue up with them during our heated discussion. They said because harley designed it to work with the bike its ok, plus tried to say cause it has brakes etc.
I just laughed, I said right, you got this heavy thing creating more wind resistance, right turns can tip over, the stresses on the frame etc.
It was just a circus. Like I said when I got done with them they were saying they wouldn't do that to me RIGHT!!!
I figure this. It takes 45 min or less to put the hitch on or take off. So I leave it off now unless needed. No more discussion on it. If something happens on the road I will just take it off, then have it towed and come back for the trailer with a car or pickup.