Building Permit Application

Would love your insights on what your building permit application was like in your experience. I know this will vary by state and municipality, but not comfortable sharing location. I am starting the building permit application process for a double wide on a basement. Dealer is also the builder—is it typical for them to provide all the needed drawings and specs? I gather that the factory supplied floorplan/manual probably has a lot of the info required, but what is typically required for a basement plan, and for additional structures like porches and stairs? Is it is typical for MH dealers to not provide these drawings, what is a good option for getting assistance with drawing building and site plans?