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I have no experience with lithium batteries in cars, but I have one in each of my 2 motorcycles.
1. They do not need a trickle charger. They will hold a charge for 6 months to a year (one of the advantages of lithium batteries). 1/2 hour at 6 amps on a charger charges them fully.
2. They are insanely light and can be mounted in any position. I've had one for 4 years and it still works fine, although a lead acid battery ought to last at least that long.
3. They don't like the cold. The cranking amps go way down in cold temperatures.
Hope that helps a little. I probably wouldn't bother to put one in a car unless I were racing it.
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