Again counseling 101 here. You do not need a 3rd vehicle or the bill for it for that matter. You have two very capable vehicles, although the Land Rover is known for reliability issues I would get out of that car and into a CPO or 2012+ E70 X5. Done.
It is just not a smart move at all, especially with a new baby coming.
I counsel military folks on the pros and cons of these types of situations from E1-E7. And I see this come up weekly.