You're right about the lack of integrity in the frame when the top is removed. I noticed my blazer started to sag a a tad shortly after I removed the top. You can even see the saging taking place in the above photo. Just look at the back side of the door opening. See the gap is larger at the bottom than at the top? Has anyone else with a topless blazer noticed this on your own?
Do the doors really do much for the integrity of the truck?