1000 lb's correct?
According to the caption. Again I'd like to see more then the one image and something to document it's common use in combat. I can't find anything to suggest common use and that's the only photo I've come cross. The more common photos of CBI Mustangs show 500 pounders being carried without rocket tubes.
As an example. I can post photos of Spitfire XII with bombs loaded. I could use those to suggest they carried them in combat. I can tell you the dates the two squadrons flew practice runs with bombs. Despite this evidence, I also know they never carried the load operationally.
Personally I'd just like to see more proof that the 1000 lb, rocket tube set up was more then just a single photo op of what could have been a test run.