Forest service job from The Dharma Bums, another classic. That story too somehow stuck with me. Him sitting up there, above treeline in some windy one room outpost writing stories.
Recommended reading: The Town and The City, his first novel before all the Beat Generation stuff that he ended up running away from after On The Road was published and he became a folk hero. Drove the dude to drink and die way too young. Sort of like another of our heroes by the name of Gerome Garcia, only by a different substance. Garcia dug Kerouac too.
I thought you were referring to Pigpen.