Benjamin seems to have had a few occupations. On his children's baptisms he is a labourer in Pensarn, Carmarthen on Rachel's baptism in 1830, a carpenter in Pensarn on John's baptism in 1833, a boatman in Steam Mill, Carmarthen on George 1839 and Hannah 1841, still a boatman in Carmarthen for David in 1844, and a carpenter in Carmarthen for Benjamin in 1846. These places are all in the same area of Carmarthen near the river Towy.
On the census he is a carpenter in 1841, a coal merchant in 1851 and 1861, and a ship's carpenter in 1871 and 1881. All St Peter's, Carmarthen. He probably combined the carpentry and being a coal merchant, and all in the area near the river Towy so ship's carpenter makes sense, as does boatman.
Hope this helps,
Rhosgoch
