Roughly what percentage of allied planes used in WW2 had horizontal stabilizers like the P-38 Lightning here? Obviously the P-38 is not "unique" for having a horizontal stabilizer, but they were not "very common" either, correct? Would you say horizontal stabilizers in WW2 were "rare?" "Relatively unique" to planes like the P-38? I'm writing something unrelated to plane design but don't want to say something completely inaccurate, and can't find the answer on the internet. Keep in mind, I'm talking about planes with two (or more?!) tails united across the rear by a shared horizontal stabilizer. Is there a term for this design which distinguishes it from all other types of horizontal stabilizers?