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I have a good set of 4 house batteries all AGM 6volt style. I have been offered a set of good 6Volt Wet cell batteries and I am not sure if my charger can handle mixing batteries.. Can I mix them on the same bank?

Recently bought a 2002 Roadtrek 200 Popular. So far, we have put 5000 miles on this year -Loving it! Joined FMCA, based on what we heard. This RT has one size 24 coach battery, we are wanting to do a lot of dry camping and are considering switching to a size 31 battery. It is impossible to check battery water in the original location between the bumper and generator from below. I have not had any problems, but have never gone two full days without driving the RT. I am considering installing an AGM battery in the original location. Is that a charging problem if nothing else is changed? I am also considering putting the battery in the left rear compartment which is only about 18" away.

My original house and engine batteries are seven year old, but are still working find. However, as proactive move I want to replace both house and engine batteries before I have a problem. Currently I have 4 deep cycle 6 volt house batteries and 2 engine batteries 12 volt. Both banks are wet cell. I have a Magnum Energy pure sine wave charger/inverter, magnum battery/combiner monitor system and power pulse battery maintenance system. I also have a residential refrigerator which put little extra requirement on the system. I am looking at Sam's Club batteries at a Mississippi store which are branded as Duracell but are made by East Penn Battery Company in PA. The same company that makes Deka brand batteries. Sam's has both AGM and wet cell batteries. As a side note batteries sold by Sam's West of the Mississippi are made by another company (Johnson Control ??) and are branded Energizer. I have had good service from the wet cell batteries, but they do have a higher level maintenance requirement. Which bring me to the AGM batteries which seem to require little to no maintenance. However, the AGM is rated about 40 A/H less (190 A/H) than the wet cell batteries (230 A/H) sold at Sam's and the AGM cost is about 60% more than wet cell. I have been told that AGM batteries charge quicker than wet cell. Does anyone know if this is correct? If a person is willing to deal with the maintenance requirements of wet cell butteries are there other advantages to AGM? Do AGM last longer? Do AGM batteries perform differentially even though they are rated at a lower A/H? Which ever way I go I will need to be 100% AGM or wet cell because my charger/inverter would need to be set accordingly for both battery banks. Comments/thoughts are welcome.

I have a chance to buy 4 6 volt AGM batteries for my coach for $131.00 each should I jump at it.