If they are 6V the Ah on the battery will be at 6 volts. So at 12 volts its half that. So when charging two 232 Ah 6 volt batteries on a 12 volt charger your charging 232Ah total not 464Ah. Still it sounds like your charger is a little small. If the batteries are fully charged and the charged does not do the cleaning cycles I think you'll be fine. The cost of batteries is quite high, why not just search and find a charger that can charge two 6V batteries that has plate cleaning cycles.
I'm using Noco Genius.
TV: 2013 F350, Lariat, 4x4, CC, LB, 6.7L Powerstroke
FW: 2013 Jayco Eagle Premier 361 REQS
Additions: Onan 5500W LP Generator, Surge Guard TS,
.......Roof Satellite Dish, Vent Covers, Bedroom Vent Fan,
.......Rear Reciever, 12V DC Outlets (6), 320W Solar & Controller,
.......4 Lifeline AGM Batteries (600 Ah @ 12V),
.......Stereo Upgraded, Interior Speaker Upgrade, Amp