Boxed Frames, how does it feel?

[texanidiot25]

We all know the frames on these trucks are flex-tastic. Shoot, over some odd-uneven corners I can feel the truck flex a bit in the floor. Of course, back then GM built these trucks with that flex accounted for. But when we go and box frames, how does it effect the ride and handling with a stiffer chassis? My next big project I'd like to box the frame and get rid of the flex, but I've been curious as to how the trucks do with it. As, instead of the frame and body flexing over bumps, this makes the suspension work that much harder.