Good info. I have been researching trails and I have two sources that you may consider:
First is Gaia GPS (I have the iPhone/iPad app, but they also make an Android version too). I have been using it since I was turned onto it in 2012. Excellent product with MANY layers (maps) and
the best thing about it is that you can easily download any of the maps to your device for offline use. I've used it in Death Valley, Fort Irwin, the Mojave Natl Preserve, Moab, etc without cell service and it works like a champ. Keep the phone plugged into a charger and you have a tailored/exact location reference at all times. The two iPhone screen captures below show what some of the relevant map layers that you can use have (when you have the GPS going, it will show your location in the center as an icon). Maps are scalable down to 1:12k normally.
Second reference are two books that others have recommended (but I cannot attest to since I haven't purchased them yet...but I intend to shortly).
Great Basin SUV Trails Vol 1: Southern Nevada (2005 publishing) by Roger and Lois Mitchell
Nevada Trails Southern Region (2011 publishing) by Peter Massey
Good luck to you, but those are additional options for your kit bag.