4th Edition DF chart - Opportunity Fire question

[cjsiam]

Troubled by the imprecision of the words.....though agree in concept...

+1Opportunity fire against personnel is pretty clear....

But a unit being transported---by wagon, by truck---is that a personnel unit? -- by definitions it is not....So no + 1 modifier....
...it's clearly moving in open (words from another place and time...) So you can DO Opportunity fire AGAINST a wagon transporting an Gun---but, no +1 for Opp vs. Personnel.

I'd agree the +1 vs. AT (or +2 vs Art) applies when you are deployed to fire, i.e., unlimbered only...

SO---Can anyone make a defense of there being ANY COLUMN SHIFT AT ALL? to the DF? ... no +1Opp vs. Personnel, no+1 as AT....  It's moving so you can Opp fire,
But I would put forth you get NO MODIFIER.....

How am I wrong? quote a paragraph...