It is explicit that is it 2% of the Combined Hull Tonnage. Not 2% per section. If it were per section it would have to be 1% per section anyway for it to remain consistent with the 2% for the inferred example of two hulls.It isn't EXPLICITLY in the rules not do the rules EXPLICITLY say it isn't right. The only example is for 2 hulls. If there were an example for 3 hulls then it would be explicit one way or the other. I know of no official examples for more than 2 hulls.
In fact the description mentions two OR MORE independent vessels.
If it gave an example of 3 hulls and the extra tonnage required were 3%, 4% or 6% it would be inconsistent with the rule.
Since it doesn't give an example of 3 hulls there is no inconsistency and 2% regardless of the number of sections is the only possible interpretation consistent with the RAW.
Personally I'd be happy to go with 2% of the tonnage of the smaller vessel, but that is a change to the rules.
EDIT:
There is an official example with more than 1 breakaway section. The Deepnight Endeavour (Great Rift Adventures 1-5 p45) is 100,000 DTons and has 6 breakaway fuel modules of 10,000 Dtons each.
The tonnage lost to the breakaway aspect is 2,000 DTons. This 2% of the combined tonnage.
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