I am an electrical engineer so I have some credibility here. EV’s are not ready for prime time. This most due to the long recharge time. RV’s have some urban applications and are viable where extreme weather is uncommon; think southern California. But in general, the internal combustion engine has a long long future ahead of it.
I believe but electric car vehicle sales are going more or less straight up. Granted we’re still talking about about small numbers coming off a small base. But the big car manufacturers have all announced plans for big electric car roll outs in the coming years. The number of announced battery gigawatt factories went from about 17 in 2017 to about 85 in 2018.