They probably wouldn’t have to be charged every night. Most routes probably aren’t more than 50 miles, these days their ranges are inline with ICE engines, so 250 to 400 miles. Of course taking only a small chunk of the charge each day also means you could just wall outlet charge them, easy to trickle in an eighth of the charge overnight.
PO next to where I work had some sort of fire situation last year. Never found out the details just a LOT of trucks. Fires happen.
I have had two engine fires myself. They are easily put out. EV fires can be a very big deal.