We have a good deal with Mercedes as we use the vito vans & dualiners for all the training vans now (changed recently from transits) - when the trainers take the dogs out to work. Also I think they are proving to actually work out cheaper in the long term.
It's the only vehicle like it - we would have been happy with a different one as long as it had room for the family for personal use (ie need back seats)& lots of room for the dogs, but the Fleet Manager has been working on it for weeks & it's the only vehicle - with a van back - & a nice seated area also.
Won't be getting it for about 5 months though. As they don't come standard with air con / then we have to sort out the configuration of cages etc, so we reckon minimum of 20 weeks.