Whatever they have at Samsclub is what we get, current set of GC2 batteries are Duracell with 5 years on them and a good ways to go. Set we had prior from Samsclub were Interstate, still going after 8 years (tested good at Napa) but Samsclub had a ridiculous sale on our Duracells that I couldn't resist, plus they have a few more amphours.
Batteries are primarily made by a couple of manufacturers anyway, proper charging is paramount followed closely by monthly maintenance. We always keep our rigs plugged in while in storage, smart converter/inverter charger does the rest. For about the price of gas on a single RVing trip we have our batteries covered for the next 7-9 years,