Here's the answer to your question. https://www.southwest.com/html/customer-service/baggage/special-luggage-pol.html#baggage_special_luggage_pol_tab_list_tab_1r My guess is that beer would be treated the same as wine and wouldn't be subject to the 5 liter limit. I think the rule is to minimize the amount of flammable alcohol as opposed to liquid. You can ask the question of the airline by clicking on "contact us" below. I would recommend a case of cans instead of a case of bottles wrapped by a couple of sturdy garbage bags and placed in your checked luggage.
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