An argument could be made for that line Jack, but the design of the ladder bar connections would play a big role in that. With a single mounting point at the front of the bar, the two rear points will swing in an arc. If they're set up at static ride height that would mean that they get effectively shorter (moreso at the top on the up, moreso on the bottom on the down) as they move through that arc wanting to pull/rotate the axle forward. The mounting to the parallel springs wants to keep the axle in a fixed point in a vertical plane so binding would ensue. Some flex in the spring, and properly pivoting shackles at the rear mount of the spring might mitigate that a bit, but (imho) probably not enough for decent ride quality.