I have a 2002 Trail-lite Model 212 on a Chevy chasis. The bathroom is a combination shower, sink, and toilet. The existing shower tray and sink is one molded piece of fiberglass. I want to replace the shower tray with a standard tray leaving just the shower and toilet. Basically remove the sink because it takes up so much room. I have been unable to locate a shower tray with the correct dimensions - 30" x 34". Has anyone done a bathroom remodel and/or have any recommendations? I appreciate your thoughts. Thank you