The eastern route through Texarkana adds 90 miles but is probably the most reliable option. If you go direct via Denison, TX, the leg to Fort Smith is 205 miles, but cutting through Wilburton saves 9 miles and puts you on slower roads. This is doable if you have favorable weather and keep your speed in check. If you have a CHAdeMO adapter, there are a few charging options on the direct route that will save considerable time compared to going through Texarkana. Also note I'm routing to the Supercharger in Van Buren rather than directly to Fort Smith.