ORIGINAL: FISH KILLA
ORIGINAL: sloppyG
sounds like your shocks need thinner oil, not thicker
Thinner would make it bounce even more. Thicker will slow down the rebound and help his problem. He seems to have tried many things already though.
Let us kno wwhat pistons you are using. They may have too large a hole in them.
depends on why it's bouncing, if it's setup way too stiff (springs or shocks) it may bounce because the suspension's not absorbing the impacts
thickening the oil slows the compression of the shocks as well, and if they can't act quick enough the truck won't handle well
if the whole truck is bouncing and the suspension doesn't look like it's working hard the setup is probably too stiff
if the truck is pretty much staying on the ground, and it's bouncing on it's suspension (like a trampoline, but with wheels still on the ground) then more damping (heavier oil/smaller pistons) is in order