Alaska,
This gent makes some of the best cables available.
What size cable do you need
I have 3 batteries, in my 2000, The 2 stock batteries one under the hood, and the one on the side rail frame, then the 3 rd. is 3 feet over on the fdrame, almost under the passenger seat area.
If you put the batteries in the rear of the van, get the largest ones you can afford.
The 2/0 is great stuff, but the 3/0 is worth the extra money, not much more with this gent.