I have a Javelin Renegade trailer. It has mono springs. One leaf per axel. I cant seem to find the right length. I need to replace the back two. Anyone who has done this. (HELP) I have measured the springs and come up with 27 ins center to center. All I can find are 25 1/4. The back springs must be weak, they are almost rubbing the tires. Any help or advice will be most welcomed. Thanks, Rick