Opinions-- going to four 12v batteries

[Mark45053]

The 6 - 8v batteries in our Club Car are finally shot after 13 years of use.
I have been reading how the 8v batteries give longer run time but that is not a big factor for us. Our cart is used for maybe 30 minutes a day maybe 3 or 4 days a week during the summer months. Weight is a factor however as we use it to run up and down hills and trails in our woods.
I was thinking of switching to four 12V.
Another consideration is I have an expensive computerized 12V de-sulfication charger I use for deep cycle trolling batteries.
My fear though is will my 48V Club Car charger work with the 12V batteries and will I get the same kind of life out of them.