Glenn,
Caster shims can be used on a Magnum chassis, and the amount of change is determined by which shim is used. The main question is why do you want to change the caster on your coach. Performing a caster adjustment is something that should be done as part of a comprehensive suspension check and alignment, and anyone that is qualified to do that knows how much change in caster each shim will provide if an adjustment is necessary. However, adjusting the caster on a Beaver is rarely necessary.
Gerald
