They will allow camping Friday night in Asheville. Not sure on showers, do not remember if they were avaliable last year in Sparta, but I will have fixings for a "RAGBRAI" shower. Do you have a Sun SHower bag?
I am assuming there will be shower trucks in Asheville at some point (not sure about Friday night). Amanda and I have visited the Christ School site looking for water hook-up locations for the trucks.