Unidentified Guest said
> The only translation I can get form the web is that "Doss" is a pouch of tobacco, suggesting the line means that the speaker's roving is how he makes his living and keeps himself in tobacco. I can go with that, but would welcome other suggestions.<

"Doss" as a verb means sleep in an improvised or crude place, such as a "doss house", so it would be a small stretch to use it as a noun meaning the cost of the sleeping place. But I don't know.