Usually a maceator toilet is used due to the toilet not being directly over the black tank and the maceator toilet can pump over to the tank. Unless your black tank is directly under or very close that a slight angle will not hamper good flushing I doubt that a standard dump toilet will work with your floor plan.
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