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Follow the 3" black tank dump valve (larger valve) plumbing back to the tank removing any access panels as you go. Once you find the tank location check the curbside straight across from tank end on roadside and see it there is any access panels to the tank. This may give you the direction the tank must come out. Don't forget about the plumbing coming down. You may have to pull the toilet and floor flange for tank removal.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7