I don't think they would remain "flipped" Hap. I am aware of what you are talking about on a leaf sprung car/truck, I've done that before but the front of those leaf springs attach to a fixed location, trailers have shackles on both ends. Once the spring compresses far enough the shackle will "snap" back to where it was I believe. Mabye BobWanderer can confirm or offer advice as he's worked on a ton of heavy duty trailers.
We still need to get together for a cold beverage some day, heading up your way to Brown's on the Owens for the Fourth of July week.