In that situation, you will use hardly any charge It will sip the battery. When you’re hardly moving, the truck is hardly working. Slow urban driving is one of the best use case for EVs in general because they are not fully powering on the engine when they are idle.
The truck’s computer is constantly learning, you can program in your trailer and how much you’re hauling and it will adjust your range. And the it will re-adjust when you’re at highway speeds.
I totally get why it’s nerve wracking but I will say Ford is putting a lot of resources into cracking this.
Once solid state batteries are a go, they will be lighter and have greater range. Once they get much lighter you will be able to stop and swap a battery pack instead of plugging in.
I hope big venues take some of that federal Inflation Reduction Act money and install some chargers in areas where rigs can go and plug during the event.