After some low speed chugging on some dirt roads, the coolant got hot
enough to warp the plastic hose couplings I used further, causing them
to leak yet again.  So, I searched around town here in Flastaff and
found some super beefy galvanized steel couplers at Ace Hardware.  An
afternoon later, and it's fixed right... well, at least, more right.

Upon inspection, the plastic coupler was very deformed and it's clear
why it leaked.  I was suprised, at first, since I used the same
plastic unit on my other van, and it has been solid from the get go...
but in thinking about it more, that van has always run much cooler
than my older Westy, which I've suspected could use a new radiator.

Thanks again for all the help.

James