It sounds like you pretty much have a whole new suspension, under a well taken care of trailer! That makes more sense than just buying a whole new rig.
My former FW had a lot of sqeaks and creaks when going slow through the campgounds. I replaced shackles and bushings on it, nothing near your complete overhaul.
My current FW came with the Equa-flex system on it. Seems like a good setup, a bit of a rubber ride. I don't have many miles on yet,so still quiet. I purchased it new 8/15/12.
Hope your first outing went well, and you didn't get caught in that snow/ice storm, that should have been East of you.
Congrats on the upgrades, that should take you into retirement travels!!
Jerry