Rear Cargo Carrier

I have a rack on the back of my trailer. I thought we would use it a lot, but have only used it a couple of times, our stuff goes in the back of the truck. The rack slides in/out under the trailer. The rear leveling jacks are mounted to the rack so they end up hanging down lower, limiting some ground clearance. When we bought the trailer (used) the previous owners had put enough pressure on the jacks, which put enough pressure on the rack's trolley bearings, to shear the little axle between the two bearings of the trolley. I tell all of this as a warning to think about the "whole picture"; dont focus on just the immediate problem. The trailer is a 2005 Keystone Cougar 301BHS.