Is it just me, or are you contradicting yourself in this post? First, you say that campaign funds should not be used to pay the tickets, but then you state that campaign funds could be used for paying the tickets. It seems like the only difference, in your mind, is whether he owns the vehicle himself or whether it is one borrowed for the campaign?
IMO, regardless of who owns the vehicle, campaign funds should not be used to pay parking tickets. Essentially, he (or his driver) broke the law. Breaking the law is not part of "the cost of campaigning."
If we are going to hold elected officials to higher standards than ourselves, we need to be consistent. The money needs to come out of his pocket and not the campaign coffers.