Chuck -
I bobtailed my FLD before it was turned into a motorhome. It also had the air chairs, air cab, air springs front and back. It road pretty good.
Put the motorhome on which deleted the air cab and it road like a Cadillac! No comparison, the motorhome ride blew the bobtail ride away.
I had a 28' box with 336" WB and weighted in at approx 31,000 lbs. 20,000 lb air rear & 12,500 lb spring front with Broc's airride.
The more weight the better they ride