Jump start is free, battery is cheaper than a tow and everything else you would have to deal with. And you have a battery or 2 in the camper that you could try in a pinch, if they're still charged.
Why not start there?
Long explanation, but there is no disconnect from the 12V+ on your trailer plug. It's hot all the time, unless something has been installed aftermarket on the truck or you mean there's a disconnect ont he camper side.
Regardless, camper batteries ain't going to do squat behind 30' of 8-10ga wire to start the truck. Won't carry enough current.
