Well I tried to buy new softer spring bars for either the Blue Hitch that I inherited with my trailer, or the Valley hitch I had before. Both of those had 1000lb bars. But in each case a new set of bars was over $225, so I bought a new Reese WD hitch with 600lb bars for the same price.
I buy into Andy's philosophy on soft rides for AS's so this along with the softer ride of the 2011 F250 SD and keeping the C range tires on the trailer should hopefully keep the rivets where they belong.
I also use soft water when washing it.