JaxN the vandwelling cat, circa 1996(?) he was 4 months old here. We did well over 100,000 miles together. He did not do harness!! He weighed 22 pounds grown & I could let him out in a national forest, or any other place, & simply say "Pack the cat!" & he was aboard!!
I lost the pics all in a flood but had the best pic of him walking down the main promenade at Mt. Rushmore. I reached the bottom & looked back, people were parting like the red sea as he sauntered slowly along that long tail held high!
I was lucky with 3 travelling cats in a row that I could trust out in nature & to come when called. It's why I now have a dog...she doesn't come very well yet, I needed the challenge!!