well I thought I would update again.
I am still very please with the soft ride of the D200 front springs. After several months worth of trailer pulling and just driving around empty thisis what I think,
1. truck rides & drives Very nice empty.
2. truck rides Very nice with a 20' 3800lbs boat W/ tandom axle trailer behind. Very slight front end sway.
3. truck rides very nice with 24' 5000lbs travel tandom axle trailer but has more front sway than I care for. On the freeway its ok but on secondary highways the trailer wants to pull truck around. I have not tried with equilizer bars yet because the truck is to tall for my bar set.