Heater strip install
I have a 210 with ducted A/C. Bought a strip online for $60 bucks 2 months ago. I went in through the top by removing the shroud and a sheet metal panel. The strip slips into a pre-drilled hole on one side and is held in place with a sheet metal screw on the other. The screw is the reason it is basically impossible to install from below - the unit will slide up in easy but no way to fit your hand, hold the screw, hold the unit, and a screwdriver in that space. Still have to remove the duct on the inside to connect the wire harness. Allow at least an hour start to finish mostly to put the shroud back on - a little bit of wrestling and a lot of screws!
My unit was already wired for a heater strip on the thermostat so no issues there.
It was about 45 deg in the barn and when I tested the unit - the air definitely felt warmer after 30 secs - the strip itself was too hot to touch.
Nice unit to take the morning chill off but won't heat the camper like the furnace.