Hmm...no, no spotting scope. Else it can spot everything else too! (And with pt vehicle it wont give it away)
Focus vision forward? Or Armored vehicle detection on minimap after 10 sec standstill?
Mind you, I LIKE the spotting scope idea, but usually self-spotting TDs don't work out very well (remember elefant maphack?)
Which is why I suggested these alternatives.
Elefant maphack only exists because the Elefant has spotting scopes and focus forward. Without focus forward the scopes only give ~10 extra vision, without spotting scopes focus forward is only out to 60 (same as SU-85).