I'm giving a quote on Thursday for a interior detail on a large RV like satellite van for the Weather Channel. They say its 26 feet with carpet thru out the vehicle including the walls. Not sure but this things probally been running around New Orleans and is probally filthy. Any one have any ideas on how to price this one. I know I should just charge my hourly rate but they want a price up front and I have no idea how long this will take me. Any ideas?