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Midnight Solar is the only 72v charge controller that I found, they are also over $600... Xantex makes some nice 36v and 48v charge controllers that can handle high open voltages (over 100v open voltage) but splitting the power to two different charge controllers is sketchy with a good chance of equipment being destroyed.
How many sun hours would your panels get if you put them on the roof of your house? as much as I like the idea of charging your car off solar, you do need a way to fully charge the batteries right away or you will drastically shorten your battery life and with $1,500 worth of lead acid batteries I'm sure that replacing them is not high on your list.
There are not many options on Ebay for 72v chargers either without spending nearly as much as you would on a brand new one, the upside to that is that buying a quality charger isn't going to be much of a loss if you decide that you need to sell it, I tried to cobble together different chargers for a while, but I must say, I charger that just works and functions how the batteries want is great!
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