I'm very glad Missy has got a van because she too needs every advantage she can get, and I think in a years time your opinion will have changed too.
Remember my trailer was 400l plus reel.I wasn't strong enough to pull it up even a slight incline.
In the van I found the 400l wasn't enough, I had to call back to refill, so now it's a 650. Yes I am heavy on water, partly because i have a hot system (they only work with a high flow), but this also lets me work fast.
I don't have a di on the van, and the reel is mounted on top of the tank, exiting the drivers side door.