I've had the opposite situation. I had 2 Laramie's, one standard and one with the off road package. The "standard" suspension was the worst for towing my 26 foot camper followed next by the off road suspension. The off road suspension was stiffer and for whatever reason did not sway quite as much. I use the Tru Trac WDH with built in sway. It certainly helps. However I still didn't feel comfortable over 60mph. I bought a limited last fall and towed only twice with it. It was night and day difference with the air ride and it was not because of the load it was because of the sway control. The last trip I took was 3 hours and I comfortably drive 70mph the whole way in a cross wind not a bit of sway. I really cannot say why this is but I can say it factual. Possibly the level feature? I wouldn't think so since the numbers are all the same, hitch height, fender to ground, axle weights etc. All I can say is it does not sway like my other trucks did without the air suspension.