Had a look at a Prius recently?
It's all about drag reduction.
All Terrain Vehicles aren't known for their amazing fuel mileage.
Let alone when you add tons of armor. Getting even a light truck to move on electric power will take a stupid amount.
Now electric weapons is a different story.
Laser anti missile batteries and electromagnetic cannons.
https://m.youtube.com/watch?v=1dHZg9XsKDQ