You're not going to flip when your rear tires only climb 10". You're still planted and stable. Drive an off-camber section of trail and you'll see how the unretained trucks unload and flop. I have pics of this, but the pictures do the trail no justice at all and everyone would just laugh at me. However, it was a D-90 (which is at my house right now), crossed a log on an off-camber section of trail and about lost it. I was talking on the HAM at the time and cussed all over the place with anticipation. However, the retained trucks had no issues.
Also, you say that a truck retained, in the video, would have lost traction "10"" before yours did. That's 100% not the case. With every action there is a reaction. Just because your truck dislocated its spring does not mean a retained truck would have lost traction at that very point. It is possible that a retained truck could have kept going because the force on the opposite wheel would have pushed the climbing wheel down. This works better with longer-than-stock bump stops, but whatever... Your spring unloaded because it was free and able to do so. That does not mean a retained truck would have pulled the wheel into the air (Einstein quote).
Softer springs will climb a fag-boy RTI ramp better than heavy springs. No shit, Sherlock. Give me some Big Blues, big boy, and I'll show you how to go to the motherfucking moon. But two trucks, side-by-side, on the same set-up, one will do better than the other on the trail. I'm not talking about the RTI ramp...I'm talking about the trail, where it counts.
Here is the deal!
You lower your truck to 2" of lift. With cones.
You send me a 2" lift after Steve Young returns it because he claims "sagging springs".
We run the same set-up, but I'll be retained with Expedition Exchange retainers.
Then we do the Pepsi Challenge at SCARR. The first one to drink 6-beers go's first. The first one to get stuck where the other made it, or the first to flop where the other did not, looses. I get naked pics of your wife, too (not the ones I already have).
