I have been researching my friends gypsy family. Most of the occupations I've found so far are Hawker or flower Hawker, collector of ferns, agricultural Labourer, general Labourer, market gardener.
In this family they had grand Biblical names such a Solomon, Abraham, Matthew and other names like Adelaide and Keziah.
In the 1901 census, three of the families were living next to each other.
Their addresses were things like "Birch cottages"
In the 1939 register, it said "Birch cottages" (a caravan)
Don't know if this helps at all but thought I'd share what I found out.