Near nonexistent. Battery size requirements and battery charging rates make EV RVS either really expensive and really impractical for distance travel. You would need to put a huge battery (say, 300 KwH, which would cost $60,000 just for the battery), to get a reasonable range of 200-300 miles between charges, depending upon the efficiency of your RV. And then, even at a level 3 DCFC Charging station (providing 50 KW) you're looking at 6 hrs of charging to fully charge the battery.