Hi LostInOz,
I love your name considering you live in Kansas. :)
We have a 2007 Ford E350, but my comments will apply to your Chevy.
If buying new shocks, I highly recommend the Heavy Duty (HD) Bilstein shocks.
CLICKING HERE will take you to my write-up with many pictures showing why the HD bilstein is the best choice for a motor home application. Not just the shock itself, but the mounting hardware is heavy duty. Then consider that wimpy hardware failed on my old shocks. If you wonder, I CANNOT say the "HD" rating makes a rougher ride. They simply offer great handling.
You have a front and rear stabilizer bar on your Chevy. Before replacing them, make sure their end links are tight. Any play in them will reduce the bar's effectiveness. With 50,000 miles driven, it's likely the end links need tightening. The 4 rubber bushings that make up the soft part of each end link might also be worn to the point of needing replacement. Sometimes they can wear to the point of being missing.
Over-inflated tires, exceeding the requirement of your actual load, will also cause the rig to wander excessively along with offering a rougher ride. But your fuel economy would improve slightly.
