I'm refurbishing an old "Northern Tools" trailer to pull behind my 2013 triglide. It already had leaf springs on the axle but I would like to also add some shocks to the axle to hopefully reduce the trailer bouncing around when empty. Does anyone know of what type of shocks I should use and where I might find them?? Cause the trailer is only about 40" x 44" (or something like that) and a maximum weight capacity of around 600 lbs. Any suggestions are greatly appreciated.