I think that electric that is practical for RV Coaches & trailers is some years away.
A lot will depend on companies that are working on class 8 trucks and how it works out in the real world. Tesla, etc)
The other problem is the power grid infrastructure to supply the power needed for charging. Some utilities are already having problems withe their transmission system in neighborhoods that have a high number of electric cars.
Keep in mind that to charge an electric car in roughly 8 hours takes a 50 Amp 220 Volt source. Now think of what will be needed to charge an HDT or MDT truck or coach. Without MAJOR improvements to RV park electrical systems it would not be possible. Such improvements could be in the 100 of thousands dollars for an RV park depending on size.
There are many questions both technical and financial before large scale use of electric trucks will become mainstream.
I may be off base and but I really feel that the HDT, MDT Coach future will be hydrogen fuell cell vehicles.
One last comment that maybe a bit political would be solar power only works when the sun is shining.
I hope you take my comments as more of a technical look than a political stance.