Can anyone point me to a source for the words of this song?

I think it starts:

I'm just a country carrier, a noble chap am I I whistle and sing from morn to night...

and includes the phrase:

So clear the way when Joseph comes, you crawlers all take care

The chorus starts:

Round goes the wheel...

and finishes:

...me and me old grey mare.

I'd appreciate any info, especially about the origins of the song.