If just going for a trade build - I would suggest a Type 6 with something like this loadout:
http://www.edshipyard.com/#/L=60W,mpU0- ... 27Q403w0nE
No weapons as you aren't a fighter, D rated equipment apart from FSD for lowest weight = longest Jump Range.
Shield boosters to help you live long enough to boost out of trouble if interdicted by an NPC.
That would give you 100 space for cargo and a jump range of 19.5Ly Fully Laden.