AGM batteries are a good fit for off road vehicles. Wet cell will weep acid if you go off road much, or are on a crappy roads with a stiff suspension. They have good CCAs for starting and decent amp hours for running off grid for short periods.

But, like what has been mentioned, they require 14.4v to 14.8v to properly get a top off charge. There are thousands of people running them with insufficient voltage and are having no issues. Some people who use their rigs for extended wilderness trips, have mentioned having some concern for a proper charging voltage on these AGMs. I would guess that these batteries will last 6+ years if taken care of, but might not go 4 years if not charged properly.

You can put a charger on it two or three times a month, especially after a camping trip. You can also install a GM diode that fits in place of the Alt S 7.5 amp fuse. The GM diode does not have a fuse, it is a diode that tricks the alternator in to putting another .6 volts to your battery, there by raising your charging voltage to accommodate an AGMs charging needs. Now this is a concern for some who worry that there is no fused protection in the Alt S circuit by running the GM diode. So enter the HKB voltage boosters with fused protection. There is also ArcLights offering and looks well made with a switchable voltage boost, but he is a small business and Covid has him shut down for awhile.

I recently went with "Dirty Parts" Voltage booster. It arrived across country in less than a week. Ironically I installed it yesterday. Here is a link to Dirty Parts page and a video I did installing it.

Dirty Parts

https://www.toyota-4runner.org/3474576-post87.html