For CAO packages on a CAO aircraft, if the packages are accessible, there is NO LIMIT. Even if the packages are in a ULD but the individual packages are still accessible, there is NO LIMIT.
According to State Variation USG-13, even if packages are not accessible, you May load:
a)Ckass 3 PG III with no subrisk,
b)Class 6 without Class 3 subrisk, and
c)Class 7 with no subrisk
You were asking about Class 3 PG II, the answer is NO. Class 3 PG II must be accessible.