I ordered and had installed the Sulastics. www.sulastics.com
They improved the ride signifigantly.
The rear of the truck was still too high, and to further improve the ride, I had my shop to remove the second from top spring leaf ( it had the overload spring and three leaves 1/2" thick and 3" wide), at the wheel, the bed went down 1 1/4".
They also installed Bilstein shocks front and rear.
No fear of the springs being weakened too much; should I have a gross load, the air bags will support.
I attribute the new ride to 75% Sulastics, 25% to springs and Bilsteins.
$950 spent---got a super ride!!
Thanx to all members that replied.
I strongly recommend the Sulastics.
jbpack1 2006 Dodge 2500, 5.9 Cummins & 2012 246 RLBS Wildwood Heritage Glen