Hi wpaters1229,
I believe that you experienced the same problem we had with our 2003 Jayco Chevy Class C. We experienced uncomfortable brake shudder/shaking (caused steering to shake side to side) when the brakes are used hard (like on an extended downgrade). It was caused by rust and corrosion on the calipers.
We could see that one of the brake pads was worn more than the other. Found that this was not uncommon on Chevy class C's. You can see our journey to find the cause and effect a cure in the thread listed below. It includes some pictures. Took time to find the exact cause but after the fix our brakes worked great. Did not need any special slotted rotors or special disk pads. Amazing difference when the brakes work right.
http://forums.motorhomemagazine.com/index.cfm/fuseaction/thread/tid/25738198/srt/pa/pging/1/page/1
