I've been hearing some clunking and thudding recently when extending and retracting the slide. I checked it out this afternoon after returning from a few day trip.
Bad news. The motor mount is detaching from the sidewall. It slams up on the bottom of the couch when extended and down on the floor/water pipes when closed. I can only guess that the torque from the motor and slide mechanism has taken its toll. The mount appears to be fixed with lag screws - now stripped. There doesn't appear to be any good way to fix it. I'm going to try to fashion some additional brackets to attach to part of the mount that's perpendicular to the wall.
Anyway, it's something you might want to check. I'm beginning to lose faith in this ultralite construction.