Soundsailor - thanks for the response. I have contacted Grand Design customer service. Their response was
"The floor/table will have to be diagnosed by a tech before I can answer your question. We’ve not been told about an “issue” with other floors so there isn’t a “fix” already set by our engineering/production teams."
In the meantime we are turning the table upside-down for travel since the table surface is much larger than the footprint of the legs. If there was a force violent enough for the legs to hit the window we would probably have other damage to the unit. There are a few other things where I will probably be taking the unit back to the dealer so will see what they say. I thought of putting something up through the bottom of the floor from the exterior of the slide out, but would have to be very careful nothing protruded that could damage the main floor of the unit when the slide is retracted.
And yes, am new the forum. Signed up to see if anyone else has reported an issue like this. To me is seems like the root cause is the amount the floor of the slide flexes when retracted for travel. Since it fits flush with the main floor when extended there is no reinforcement along the edge or under the floor. When the slide is retracted you can easily flex the floor by pressing on it with just one or two fingers. The legs of the table attached to the pedestal are very rigid, the floor bows underneath the legs and in time it pulls the screws out. Forgot to mention, the theater seats are in the same slide. The head of one of the screws holding the theater seats actually snapped off before the screw pulled out of the floor.