i have a 1000 litre system and am just in the middle of fitting the new van out,
i had the same dilemma of which van, i would defo swerve the ldv maxus, a friend of mine runs a large logistics frim, home del network( white arrow ) they had a fleet of 60 ldvs and were always going wrong
the transits bend diffs on rwd and blow gearboxs on fwd, so i avoided them
The crafter and sprinter are the same van, have heard bad reports on them
I used to work for a window cleaning firm for 5 years and they ran renault masters there were a couple of small problems but nothing major and they got a hammering, so i ended up getting one ,55 plate, mwb m/r, 3.0 140bhp with 50k miles for £5900
my 1st choice was the vw transporter, but they only take 1340kg which ok for a 900 litre tank but borderline for 1000 litre
if i had a bigger budget and didnt have the gutter-vac equipment to carry round as well i would have a transporter t32 with the 900 litre tank