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Do you mean golf cart batteries by "6 volt grp24"?Keep the 2, 6 volt grp24 that are nearly new for the house bank; get one grp29 or 27 to replace the 2, 12volt grp27s. The only "heavy load" will be the new refrigeration unit that runs less then 5 amps on 12 volt. gotta love that!! (36 degrees in 2 +- hrs from a warm icebox)
For starting you don't need more than a group 24 12 volt start battery. The two 6 volts (golf carts?) make a good house bank.