Would you replace Generator, or substitue with Hondas??

On average, I believe most folks looking at a motorhome would want/expect the unit to be remote start capable. Having to go outside and start one or more portables would not be a selling point.
At the least I were going to install one I would look at installing a Westinghouse or Champion with remote start. You may or may not be able to rig some method for fueling other than the built in tank.