>The only alternatives  i know of
>1.  put in an aux battery with capability to switch in the second
>battery as a jumper

I think he (Mark) is looking for a better way to jump start his dead
*Bronco* from the Vanagon. Therefore he needs access to the Vanagon's
battery(s).

The "NATO" connectors sound best. AAA service trucks have a similar
connector on the front where they can plug in the jumper cables.

Just get mating connectors, one for the front of your Bronco, and one
for the rear of the Vanagon (you'd have to run the cables to connect
to the starter terminal). Then just plug them together when you need
to jump one or the other.

Dave
--
Dave Carpenter

"Any sufficiently advanced technology is indistinguishable from
magic." -- Arthur C. Clarke