Class A body roll

I know this topic has been covered many times. I purchased a 2016 Fleetwood bounder 35K this year with a 22,000lbs F53 suspension. These are very tall rigs and very top heavy. I performed the cheap handling fix but the amount of body roll is still too out of control. Tiffin motorhomes adds Sumo springs as a standard feature on their class A gas rigs. Would the Sumo springs help with the body roll issue? I want to stiffen up the body roll. Road master makes a beefed up sway bar that is quite expensive, but for my issue, I think I need a beefed up sway bar for both front and back. What would be the cheapest route to begin with first? The cheap handling fix has already been done.