The Rm Runner Loop is more easily accessed from the Cove Wash TH. This can be accessed up the "black" road to the east of the Gates Ln TH. Make the first right at the sign to get the Cove Wash TH.
We road from Gates LN, up the road to Cove Wash, then go south on the single track, down into the wash and up the other side. South a bit, then back NW to the Rim Rock loops. (Rim Ramble, Rim Runner, and Rim Rock trails)
Mostly flowy, some technical sections, up and down from loop to loop. A dirt road shortcut exists to reduce the distance. A connector trail exists between the two loops.
If you start from the Gates Ln TH, there is a singletrack which goes up to the Cove Wash TH from the NW end of the Gates TH parking