U do not want a 24 v charger for your chassis. U want one like Mike posted only, one that charges 2 12 v banks. If u have 1 of your 4 chassis Batts go bad a 24v will roast the other 3 trying to keep voltage up. 2 12s will not do that and won't hide the problem either u will catch the bad apple by getting a batt imbalance early on.