FiverBob

Two like sized Trojan 6v deep cycles will give you more amp/hours than two 12v "so called" deep cycle batteries. Plus, when you replace one 12v battery, you better replace both. My Trojans are now 4 years old, I have added water three times. You can take them deeper into discharge than 12v ones and not hurt. They are rated to accept something like 6X more discharge/recharge cycles than the typical RV/Marine battery. Mine have been super. Most experts feel it is the best bang for your buck.

Bob

chuck gibson

Another vote for Optmia blue mine is 4 years old in my 5th wheel also use it for starting my 5.5 onan works great no water to check or add.