I sponged this challenge idea from Orange Crew who is from Queensland, Australia.
Challenge: Tumblin' Tumbleweed
Find 100 each of the "Trucks/RVs" AND "Recommended for tourists" attributes
The cache can be found at the posted coordinates, and you may physically sign the Log Sheet at any time once you have found the cache. At that stage, you could use the Write Note log to record your visit. Maintenance will be performed by a local cacher as required.
However, this is a CHALLENGE cache and as such you need to have fulfilled a specific task before logging it as a find online. In that log, you need to supply evidence that you have met the Challenge Cache requirements, usually by including the Project-GC Challenge Checker's output log as verification.
Logs without the required evidence included will be deleted without notice. The Difficulty rating reflects the difficulty of the Challenge and the Terrain rating reflects the difficulty of access to the cache.