i use a hyperion 0606i charger. it charges everything and i have a adaptor made that has all the plugs i use on it.
but you have to charge one at a time.
what i do is charge everything the night befor and so when im there i dont really have to charge anything. maybe if i drive enought i would have to charge my rx battery but now i have like 3 extras that are charged and 2 extra ignitors that i keep charge.