We headed up to Tropo after getting some excellent pointers from Etienne K7ATN. He and Darryl WW7D were also up here a few days ago.
The route we took started from Morton, WA on Hwy 7 northbound. Unfortunately, Google Maps wants to route through private gated property. So we continued on north until NF-74 and turned off there. We followed NF-74 to the crossing with NF-295. Beyond that point, you will need to disregard your vehicle's paint job. The scrub brush is very ingrown on the next section of NF-74.