the vauxhall combo is a rebadged fiat doblo,
they come in either 750kg or 1000kg payloads, the maxi (lwb) is 1000kg payload and most of the swb are 750kg, however not all as there is a option to have the swb van upgraded to 1000kg payload from the factory, easy way to spot is all the 1000kg payload vans have 16" wheels,
i have one and its excellant, i have a custom made 600l tank with heater and it carrys it fine, depending on the shape of your tank you could fit a gutter vac in, the load bay inside a maxi is just as long as a swb vivaro just not as wide,
I looked at trafics but was put off by there poor build quality and stories of them falling to peices, and the doblo was cheaper and imo a better van.
