When I bought my TC a couple of months ago I helped the seller load it on my pickup, He did not even tighten the bolts on the jacks more than finger tight after swinging them down, that plus them being cranked up to their highest because of his driveway... and because a couple of the mounting points were rotten made it unusually unstable. When I got it home and did my first unload I tightened the bolts down - big improvement - but then for my peace of mind, after having jacked it up a couple of inches from the truck bed, I grabbed the TC and pushed and pulled at it to see if it really was dangerous (figuring if it really was unstable it would just fall down on the truck). I moves around but it is basically pretty stable. Since than I work carefully but with the confidence that it isn't going to just dive off the jacks all by itself. My biggest fear is of pushing it off the jacks, by hitting a jack with the truck or not having jacked it up enough... so like I said, very carefully.
