The Great Basin Rim is an overland trail that I have put together from existing roads that follows the rim or drainage divide of the Great Basin for 4883 miles 7858 km. I arbitrarily chose Oregon for my start but it is a closed loop. Through the states of Oregon, California, Nevada, Utah, Wyoming and Idaho, and from sea level to almost 11,000 feet altitude the route is 70% on remote dirt roads. Most of the paved portions are in southern California and Nevada. There are a number of times that the trail is over a hundred miles from the nearest gas. There are a number of areas that are impassable when wet and the portion that crosses Utah's Skyline Drive Road is only clear of snow from late July to early October. I believe the technical challenges are not very extreme and an SUV should have no problem. I will be taking a motorcycle with a sidecar, 1wd. (Emphasis on "should")
The Great Basin Rim was entirely drawn with Google Earth Pro which is available for free HERE . I save all my road segments as .kml files but they can be converted to .gpx files for most gps units HERE. The image atlas photos are simply screen shots that I made from within GE. They are not too big and I can fit them all on my aging Motorola G+ phone. These alone in combination with paper maps (I usually have Benchmark books with me) I think are enough to navigate the entire route.
What's enough? I do not use turn by turn navigation with my gps. I use the (now) Garmin Inreach Explorer. I have loaded into it individual points for the beginning of every road segment. The file name for each point consists of a consecutive road number, the length of this segment and cumulative mileage to that point. When I get to an intersection I just set the gps to navigate to the next point and it will give a straight line direction. The name of the point I am at tells me how long that segment is , I set it on the odometer, put the gps in my pocket and go merrily on my way until the odometer says to stop. I know, it's my own particular prejudice, but it seems to me if you have a gps screen plopped in front of your face you have just changed the whole deal into a video game. I prefer to ride the ride and then try to figure out where the hell I ended up. It's worked out pretty good so far.