[VAL] Water tank source?

[David Josephson <david@xxxxxxxxxxxxx>]

A few dozen miles on dirt and gravel roads, an improperly repaired leak, 
and years of neglect before I adopted my 71 Tradewind all conspired to 
cause the fresh water tank to leave the trailer last week. The 1-1/4" 
plywood sheet under it had almost completely rotted out and, saturated 
with water, was no longer able to hold  it in. So the last few days of a 
trip to some remote mountaintop radio sites were spent without water as 
I made good on my promise and pulled it all out in preparation for 
replacing it. The leak was apparently in the same place it usually is; 
the corner of the tank just above where the fill tube fitting attaches.

I don't find an exact replacement for this tank on the Inca page. Any 
recommendations for other sources?