My take was that both couples are to get married (if they both agree to - I'm not to sure if the guys are going to cooperate). HOWEVER, by the phone in vote, America gets to decide which couple wins the "prize". Ergo - both couples get married, BUT only one wins the car, the money, etc. I think that's to make the couples actually THINK about if they want to marry this person. They could say "I do", and wind up with just the husband or wife - no moolah.
It does make things a bit more interesting.
I voted for BJ & Tony. BJ is a nut case, but Tony alluded to things that happened in her childhood, etc. I thing she's really fallen for Tony, who isn't good enough for her, by the way. Anyway, in my rambling way, I'm trying to say that I think BJ & Tony need the $$ more than the other two - Playboy Jill and her "I can pay the rent for months" buddy.