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Hi,Doc. Only down side is steering effort goes up - not a problem when you have power steering, and in fact helps steering feel on our chassis.
If you study suspension geometry, the caster angle causes the wheel to push up the vehicle as the wheel turns - therefore increasing caster increases the force ( gravity ) trying to keep the wheel straight. ( hope that makes sense - a rather complicated subject ) . Early cars, before power steering but with light front ends, used a lot of caster - old solid axle Fords used about 7 degrees. As cars got heavier, caster angles got smaller to keep steering effort manageable. But power steering allows higher angles with acceptable effort.
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