I have a 18' Big tex trailer and it has 3500# axles. The back hanger bracket is now bottoming out on our rough roads here in Illinois. Sometimes i have to load the back of the trailer heavier than the front. I know the leaf srings are getting worn out. i was wondering if anyone has replaced their leaf springs with ones slightly heavier ones. i know i am restricted by axle weight but having slightly heavier springs may help with loading the back of the trailer heavier than the front.