No info link provided on public Travato pages on Winnebago website, but a Google search turned up the 105-page owners manual for the two models of Travato. Still not real informative, but at least has specs on tank sizes and such as well as instructions and photos to operate various features.
link to the manualBattery is AGM. Photos do not make it clear whether there is room for a second battery.
The manual does not mention the existence or location of any 12V outlets; it does give locations of the 110 outlets. This bothers me. I use 12V extensively for dry camping, for charging my technology, and for running my CPAP machine at night.