Rip, you will need to install a converter. Should be the one called "Two to Three". You will also need to install diodes to prevent backfeeding the dash of the Nissan. Blue Ox makes a nice diode pack and they can be purchased through RV Upgrades; a major sponsor of the website. Good luck and keep us posted as to how the project goes.
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