AGM first started becoming more popular in RV van campers a long time ago because they could either be installed inside the coach due to lower off gassing, or outside under floor since they do not require access for watering.
Class A and C motorhomes’ adoption of AGM trailed because these larger motorhomes usually provide easy access for watering flooded batteries even though mounted outside.
In my opinion the main draw remains lower maintenance (no watering), and to a lesser degree also less corrosion around battery area. Other differences exist, but beyond higher cost to avoid maintenance, I doubt many RVers really care. Even longer expected service life affects costs of ownership.
Interesting to note that just like Class Bs started adopting AGM batteries first, they seem to be ahead of the curve now on adopting lithium ion batteries.
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