Motor homes vary in chassis manufacture & model (ie: Ford E350/E450, Chevy 3500/4500, Sprinter diesel), wheel base, aerodynamics, percentage of rear over-hang, center of gravity, over-all weight & weight distribution. These variables influence handling characteristics by a whole lot. Even the same exact motor home brand and model can have a slight different handling personality pending a slide out option and how and with what the owner loads his rig with. Commuting with a full tank of fresh water versus no water can be of influence.
Think of it this way. Consider a typical pickup truck, say the popular F150. When you drive it empty, it handles one way. Load the bed heavy between axles and it handles differently. Move that load rear of the rear axle and it handles differently again. Shift the load to one side and it changes again. Tow another vehicle and it handles yet differently again. Same truck, differnet loads, or with the same load distributed differently, it dramatically changes how the truck handles.
Now change the truck to an F250 or F350 and try it all over again. People will claim a difference in the way the pickup truck handles.
Motor homes deal with all that plus additional variables with flavors of wheel bases and extended bodies behind of the rear axle. Also are varieties of aerodynamics. The result is a much wider variety of owner opinions on whether suspension upgrades are neccessary.
It comes down to this. If you don't like the way your rig handles, you can do something.... or do many things to get satisfaction.
JJCruiser and I happen to have the exact same brand, model, and configuration.
JJ,
Consider getting a heavy duty front stabilizer bar. It will come in very handy when sloloming down canyon and mountain byways. If you suddenly have to brake hard, both front wheels will remain firmly planted on the road for better traction on the turns, as well as better braking. It's a huge contribution to safety, and you will also benefit some while on the open road. I think that would be much more benefitial than say getting better shocks. A front heavy duty stabilizer bar is both affordable and easy to install.