The funny thing about this ending is that this could be a legit doujin in it's own right. Reincarnated as Truck-Kun himself.
It would be a comedy adventure isekai in the same vein as Vending Machine. Just a fun little road trip as he collects new party members and they enjoy his camper powers...
I get it, he doesn't want to become a murderer by killing like a dozen or more people in the street out in the open but he really should be a bit more proactive with dealing with them. If you have the ability to kill them all, then you have the ability to mess them up. Just go Batman style and...