Jamie, all we need is for Ford to install the upcoming 2020 F-150 plug-in powertrain in a Transit or E-Series motorhome chassis, or similar.
The advantages, as previously discussed in various threads, are so many. Battery temperature control, auto start for battery recharging, built-in converter (high-capacity battery charger), very high charging power levels from engine to minimize run time, etc.
One logical possibility I really like for RVs is an OEM electric air conditioner(s) run off battery bank. With a rear A/C option we can also get rid of those loud roof A/Cs, their condensation down the side of RV, etc.