It appears the best approach: built-in Tesla trip planner to next SuperCharger - gives an optimum, fastest route and will show unplanned but needed detours. If you take the detour off of an Interstate, you will be much happier than if you stay on the direct route and get to see road rebuilding and terrible, multi-car accidents. Take the recommended detour. Plugshare - best used pre-trip to layout the overall route between SuperChargers, level 2 chargers, and the quality of service. This is your high level trip planner. Some like 'a better route planner' but I've found it resists my attempts to manually optimize the route. Waze - a segment-by-segment planner, it gives the reasons for detours and traffic conditions. Not an end-to-end trip planner, it provides useful information for avoiding problems. Bob Wilson
