Leaf Spring replacement? 08 Z71 2WD

[Steve40th396]

I have 115000 miles, new tirez, new Bilstein 5100s and the rear springs flutter when going over roads like railroad tracks, pot holes (small ones) and the like. Shocks made no difference. Front is leveled via 5100 shocks.

Cant see any obvious issues with springz. Previous owner had camper on it for 90000 miles.

Suggestions to dagnose issue?.

I did put 600 lbs of sand bags, and it made very little difference.

[mymaggiebell]

There was a warranty for replacement of springs a year or two ago.  The springs are garbage at best!

[Steve40th396]

Warranty? Even though its a 2008?

I was thinking doing it right , and getting solid aftermarkets. I dont want to replace crap with crap then.