Rivian has crossed a symbolic threshold in the push to make road-tripping easier in an electric vehicle. As Electrive notes, its Adventure Network now has more than 1,000 fast-charging ports across the United States. For drivers, that means more places to plug in, less range anxiety, and a better shot at finding a charger that actually works when they need it. What happened? With four new locations adding 44 stalls over the past month, Rivian's …