Borrowed car question...

[chays]

hi everyone! We are going to visit my in-laws for christmas and are hoping to borrow their Subaru Tribeca for the week. I have a RF (old style) BLVD for 1 yo DS2, a Safeguard Go for 4.5 yo DD and a Parkway booster for 7 yo DS1. Will this fit in the backseat? What if it was 2 parkways (DD is 45 pounds) and the BLVD?

Thanks!!!
cheryl