We do what a number of posters here do, bring the laptop for DVDs for bad weather.
It's fun to stop at Canadian Tire for new lantern mantels, say, or yet more tarp straps, then dig through the bargain bin and get a triple-feature Boris Karloff or double-feature Arnold Schwarzenegger for $4.99 and bring them along.
The laptop only has two hours battery
power, so we bring an extension cord and use a 12-to-120 volt inverter to plug into truck. Someone (!) has to go out into the rain at Intermission to start up the truck so we don't have a dead truck battery
But we learned you can meet the nicest campers, those who carry jumper cables even in summer, and don't mind positioning their vehicle halfway up a mountain to help you out!