No, EVs are no more likely to burst into flames than any other vehicle.
What is an issue is should they do so, putting the fire out is a problem.
As for an Electric Motorhome, the technology is a long way off, even cars can’t reliably hit the 300 mile target, mine has an official range of 329miles, but that’s just not real. In effect you don’t charge to 100% only 80%, and you avoid discharging below 20% this is to preserve
battery life, so an EV with 300 mile range is actually only 180miles.
But in cold weather the range is reduced, so an EV with 300mile range is actually only some 140miles in winter.
Don’t get me wrong I love mine, but avoid listening to the manufacturers mileage claims, it’s just too subjective the average miles/kwh for my car is 2.9, but I get 5.5 at times, when I decide to push on I get as little as 1.9 which gives me an effective range (20-80%) of about 90miles.
But it charges off
solar panels or OIG and cost next to nothing to run