Those are SUU-41 dispensers, one of a family of devices (SUU-34, 36, 37, 38, and 41). The stuff they dispensed was quite variable but under the general category of area denial weapons. CBU, mines etc.
I've seen exactly one photo with ordnance on folded wings and it wasn't much, probably for the reasons mentioned above.
(look near the bottom)
http://skyraider.org/skyassn/memberpics/yblood/yblood.htm