Tj thanks for th intput. Tru about going from empty mostly to saggy butt.

But the helper springs pictured will they really add tension all of the time. To me it seems that they would only be engaged as more and more weight was put on the leafs.

Or i guess with each bump you hit pressure is put on the leaf. I think taht would result in the stiffer ride you speak of.

Im going to look around for the manually infaltable bags, i didnt think that was even an option.