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Lithium titanate is nowhere close to lead acid. It's the same as lithium iron phosphate per Ah just lower voltage. 6 in series will be 50% heavier. 14.4V on a 6S pack is 80% charge which is not that bad.
I know because I run a lithium titanate starter battery. It's 15lbs 5S 40Ah. The voltage curve is steeper than some images on the internet suggest.
I still think you can use a lithium polymer battery if temperature isn't a problem (I assume it's not if it sits in the back of the car). It will only cycle in a narrow range and will probably never be depleted.
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