Volvo V70 (740, 960, 850) turbo diesel.
Space for a trolley, 5 cans and the weeks shopping behind the back seat. Or if you decide to get serious you can fit a 300 litre custom tank behind the seats (great Volvo tough lashing points) and still have space behind this for reels and bucket. I would also recommend that you have the suspension upgraded with inner coils cost about £120 fitted and make a world of difference.