Using battery charger in place of converter?

I am in the same boat a you. I have a Magnatec 950 converter, and did not want to spend money on a three stage converter or solar set up. What I did was buy the 40 amp B&D charger for $50 and use it to recharge the batteries. The Magnetec 950 is a 50 amp converter but is only a 5 amp charger which to me is not excessive. Many on here have reported the smart chargers do not fully charge the batteries which I believe to be true. What I do is charge until the B&D says FUL then float the batteries for several days with the Magnetec. I notice I can go from 5 days to 7 days dry camping using this process. If I am not planning to camp for a while I disconnect after the float charge and just store the batteries. When ready to camp again I plug in to cool the refer and top off the batteries. I check and add water once or twice a year.