SO why not just buy a Honda EU 6500i or the new EU7000i and be done
with it, yes they are not light but will handle the 15btu a/c no
problem in ECO mode on along with Microwave, lights and coffee make
all running.
I carry my EU6500i in the front of the bed of my truck without any
problems and have an extra 25ft cord if I need it. The last outing
I had the truck parked side of the 5th wheel with the EU6500i
running side of the window which was closed and could hardly hear
it and the DW didn't complain about noise