I would limit the travel with straps on all 4 corners.. If that shackle hits at a high rate of speed you could have a broken bolt.. Most of the reason you don't see limit straps is because most rigs won't even use the full range of the shackle like yours and mine do. Another reason is most people don't realize when the leafs separate at droop they're very easy to bend, limiting them reduces the chance of ripped apart shocks and broken springs.. It's the correct way to stop the droop travel. Mount the straps in the direction the wheel is traveling, or close as you can get it, ex: the rear travels down and forward as the shackle drops out so you would attach the stamp like you said on the spring plate and the top should go rearward some.