think of the debt
im buying a transit 300 this week, 1200kg payload, more that enough for what i need
with the vivaro, you are going to be pressed to get a 650l tank in the swb, leaves you with about 300 - 350kg left for stuff to carry
the lwb can take 1200kg but its 1k more, i have heard alot of bad things about the vivaro, i would like one, they look sweet handle sweet, its like having a car, but i dont want to be caught out, its the same for the traffic and primastar,
look into goggle and find some customer reviews, if you want one best bet is too buy brand new and then get your 3yrds warranty if it does go wrong,