NewSunRader

Sorry if this an absurd question, or if it’s been asked before. What exactly does it mean “get the Full-Float“? Will any dually full float axle work? I feel like I’ve looked at every forum post and can’t come up with a clear answer. I’m pretty sure my rig is a 2wd 1980 18’ Sunrader. I know I have the bad axle, but not what will work to replace it. Any help getting pointed in the right direction is appreciated.