For RV applications where most of us normally travel long distances, I think a plug-in hybrid makes a lot of sense. For city driving most people donít need a range of 200~300 miles, which adds a lot of weight and costs. A van with 50 to 100 km of electric range (31 to 62 miles) will handle most daily trips. And when it canít, the range extender can be used for unlimited distances.
Attached is link to Ford Transit Custom with 1-liter range extender; and Ford is not first to pursue this approach.
For package delivery like UPS or Amazon, a pure electric may make more sense because of average distance traveled daily. Personal use, particularly as a motorhome, is very different.