Found this will looking for 150s. Scroll down to third want ad. I thought the useful load in a 150/150 was small. Obviously built for a specific mission.

http://www.wingsandwheels.com/want-ads10.htm

Tim

The Early Bird gets the worm, but it's the Second Mouse that gets the cheese.
Chandler, AZ KCHD
1973 A150L Sold
RV-6A Hela