x2 unless you got shocks valved for dual setup. If you run two single-valved shocks you get more compression damping than you need (more effort to push the axle up) as well as rebound damping, keeping the axle "tucked" longer than needed and producing a harsh ride.Rough ride.
I did buy Bilsteins but not the 5100s. I ordered the application specific shocks they had listed for aux setup the yellow/ blue HDs.
My towing issue with the boat is reverse of a normal trailer. All the weight of the boat is in the rear (v-8, outdrive, 30 gal fuel tank) so when it bounces the tongue is trying to pull up on rear of the truck not down. The boat is asfar forward on the trailer as it can go but it is what it is.
