I plan to run the R2R2R on Sat. February 23, 2019, starting from the South Rim, running on South Kaibob and North Kaibob to the North Rim, return. I will be in Las Vegas the day before. I plan to rent a car in Vegas to drive to the South Rim, start the run early (between 3 and 4 am) on Feb. 23., run an easy pace, and finish up back at the South Rim late afternoon, before driving back to Vegas.
If anyone is interested in joining me for the run, or if you have run this route in February and have any tips (anything from renting a car in Vegas, where to park, how early to start...), please reply. Thanks!