My wife thinks I'm nuts. I keep a 10-pound portable Level 2 charger and a NEMA 14-50 adapter in the frunk at all times, even on trips where we're basically driving Supercharger to Supercharger down I-25. Her argument is it's dead weight taking up cargo space we could use for the cooler.
Then last month we were up near a state park outside Fort Collins and the closest Supercharger had two stalls, both blocked, one by a truck that clearly wasn't charging and had been sitting there for at least an hour. Ranger station had a standard household outlet plus what looked like a 14-50 for RV hookups around back. Portable plus adapter got us enough charge to make the next real fast charger instead of sitting around hoping the ICE'd stall cleared. Felt vindicated but also curious if this is genuinely smart prep or if I'm the guy who packs a tent for a hotel trip.
