You are not alone. First of all, pay attention to Chuckester57, he knows what he is talking about. I have a similar long slide with the dinette table attached to the floor and we only use two of the chairs. The slide mechanism is the underneath style like yours. When I /we use the dinette it feels like the bottom is ready to fall out. Well, it hasn't, the open side slide floor rests on the main floor and the other three sides are still firmly attached to the slide walls. I have thought about some structural modifications to strengthen the floor but...everything would have to be added to the interior and that thought would surely upset the DW. I tend to overbuild everything, so going out to the scrap steel pile for some structural shapes would not go over well.
Bottom line, if I / we ever fall out the bottom, I will fix it. Until then I am not worrying about it.
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