Yep!
A huge difference. Not just the thickness of the bar, but also the unforgiving polymer bushings compared to the softer rubber bushings that compress with every lean.
Replacing both the front and rear stabilizer bars on any year Ford E350/E450 is the single biggest bang for the buck you can make to improve the handling of your motor home.
Many people don't realize this, but the E350 up to and including year 2007, has no rear stabilizer bar at all, unless added by the RV manufacture or previous owner. Ford never installed one in back.
I got so very tired of recommending the stabilizer bar upgrade. I seemed to irritate long-standing forum members with my consistent recommendation. Thanks j-d for carrying the ball in recent years.
Ron Dittmer