We've had this discussion before. The rockets were used a bit in the summer of 45 by the Iwo Mustangs. They always had to take DTs so they never had more then 3 rockets on each wing. Even on Korea where they were closer to the front, it was usually bombs and rockets or napalm and rockets, not 10 rockets.
Depending on it being metal or paper the DTs were metal 75, paper 108 or metal 110 gallon tanks. The 110 gallon tanks are more visible in MTO or PTO photos for what it's worth. The 108 gallon DTs show up more out of the ETO as they were British made.
Understand when the bombs were loaded, no DTs are. I've yet to see any photos of USAAF Mustangs in the ETO or MTO carrying rockets. The only ones I've seen are on the Iwo Mustangs
1000 pounder on an Iwo Mustang.

The most heavily loaded Mustang I've ever seen in a WW2 photo. 2 P38 style DTs and 6 rockets. Again it's a really late in the war Iwo based 51.
Those are 165 gallon DTs.
