Now if I was a Walmart truck buyer...I might have my big base warehouse roof outfitted with solar, and build a maga charger near the loading dock. Dont need to look for a station along the route, just come home. I would buy just a few trucks to operate out of that one warehouse, and not go cpmpany wide immediatly. So the EV trucks start as a small percentage of the fleet, and slowly ramp up in percentage. My big initial investment is in the base camp - solar facilities, and just partially in the truck.
If I was Tesla ---and I'm making promises to forward thinking investors at a party - I might be elaborate in my claims. But come contract time - I'd be very careful as to what I put in writing. As implied, if you promise a big delivery, and your customer relies on that by adjusting his fleet, and you completely fail...so, dont over promise in the contract, but talk to your customer in reality terms.
Gee, whatya know.... Walmart had been working with Solarcity for a while now, setting up solar on it’s many rooftops:
How Walmart Became A Green Energy Giant, Using Other People's Money
Next step batteries and then mega/super chargers? When the majority of drivers are using EVs... might Walmart become the next “Exxon”— go there to buy your stuff, and charge up your car! They’ll just add your EV fill up charge onto your check out bill. Wonder which will be more expensive, groceries or the EV fill up?