Rick, The air intake for the house heater is just an opening above the heater enclsure. I ran my cables from the solar panels (have four) through the roof directly into the false wall, that your bedroom tv is on. Connected to my charge controller mounted below the tv opening, then down through the heater opening. Drilled a 1.5 inch hole in the steel wall in the heater enclosure into the battery compartment. The +12 VDC standoff in the battery compartment is just above the hole.
Have a neighbor who has an 05 Meridian who did the same thing.
04 Meridian 34H
2012 Honda CRV / M&G Braking