The length of time you can operate off-grid depends on the battery Amp-Hour (AH) capacity and your consumption habits. Your Via came equipped with
two Group 24 size, 12v marine/RV flooded-cell deep cycles, which typically have a capacity of about 75-80 AH each (150-160 AH total). That should be adequate for an overnight stay.
This type & size of battery is a commodity so I wouldn't worry about brand. In fact, nearly all such batteries are made in one of 4 major battery factories, regardless of the label on the outside. Just shop for the best price for the amount of AH capacity.
There are some premium brands that may have a more rugged battery case and internal structure and maybe a higher AH capacity, but the standard batteries are entirely adequate for RV use. An example is the Trojan 24TMX. It's a high quality battery but the extra value from the higher quality is modest. Don't pay a lot extra to get it.
You may find extra value in choosing an AGM battery vs Flooded Cell. AGMs are sealed and truly maintenance free. You never have to check or add water to them or worry about corrosion from battery gases. They cost more than flooded cell types, but many owners love the zero maintenance advantage.
Some years ago I wrote a magazine article on Choosing RV batteries. except for the lithium battery option, it's still applicable. There is a copy in this forum's Resources library at
RVForum - Choosing a battery