Fiat doblo without doubt, i'm selling mine but your gonna need more than 3k

Bit small that can't get a decent sized tank in there.
i have a 350l tank in it, could of fitted a 400l or even a 500l, its a bit on the small side for 2 operators but is perfect for 1
in response to the OP, its reliable has never let me down and i've spent nothing on it apart from a service, pulls like an absolute train 135bhp, has twin side doors, handles weight really well, and you could fit a gutter vac inside as well.
I've used a transit connect t230, vauxhall combo, kangoo and a doblo all for wfp work and the doblo is defo the best