If you are going to push the envelops so to speak be sure and carry some sort of jump start device. As noted most batteries just fail with little warning. The planned obsolescence of automotive batteries is 3 years. Most folks will get more than that with proper maintenance but if you get 3 years you got what you paid for. There is no such thing as a 72 or 84 month battery. They are just taking more of your money knowing that most folks will not own the vehicle that long.
Years ago I worked in a marine Chandlery and we sold a lot of batteries, mostly deep cycle both 6 and 12 volt but also sold a fair number of starting and or the so called dual use batteries. We were one of Trojan's top marine retailers and the info I cite above came straight from the regional Trojan rep. There are only a handful of battery manufacturers in the US and they all make products for hundreds of different labels with not a lot of differences in the actual production of their various product lines.
Just saying...
:C