Most of the time the over the range units are not installed in RVs the way they are installed in a stick house. The reason is that the cabinets above the stove or range does not allow for space or strength to be mounted the way the manufacturers have designed the microwaves or convection units. I have seen the RV manufacturers compensate in many different ways. Some will run screws from side cabinets into the microwaves. Some add screws up into cabinet stiles from the top grill areas as well. What I am saying is that even if you find the Sharps installation instructions, it does not mean it is installed as such.
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