[StingRay]

A reinforcement plate would be reqired at the rear inboard mounting points but the front would require some kind of tube or channel structure that ties to the rockers and/or front cab mounts as well as the z channels that run fore and aft about mid floor. I wouldn't know whether this kind of mod is at all sufficient without pull testing it and ruining a truck

Another method of making the floor survive is to make a sub structure that pushes down on the truck frame after the floor deflects about a quarter of an inch. This would stop the downward rotation of the front of the seat as it tried to submarine through the floor.

Very special consideration is given to floor strength in the vehicles that are originally supplied with integral belts. It is impossible without a computer model of the vehicle and a bazillion dollar computer or destructive testing of actual designs to know for sure what the performance would be of such a seat installed in our trucks in any manner short of attaching them to a rolll cage. I said it about a hundred times on this board that integrel belt seats just don't belong in ANY vehicle they were not originally designed for. If you're not in an engineering profession or are a race car builder and don't already know exactly what kinds of mods are likely to be sufficient then you shouldn't be installing the seats. An autobody frame guy would have a real good idea as well as to what parts of the floor would need reinforcing and how to do it.