MBrown,
The posting is a little short on real information. It sounds like you have a motorhome. It is well setup if you have a pair of GC2s for a house bank. It should also have been built with a converter/charger. If what was OE is not very good, you would do well to replace it with a modern 3 or 4 stage unit. This is a much better option than carrying and using a stand alone charger. Yes, many stand alone new chargers are very good, but they do not do well as converters. This means that some of your 12V equipment may not like what that stand alone is doing.
This is a battle I fought for years before the depression killed my boat work business. Owners always want an answer for a fast way to recharge the house bank. Well, it just can't be any faster than the batteries want it. If you are in doubt about this, read up. I was going to include a link, but what I had seems to be broken.
Basically, you can do about 90% in a few hours no matter what you throw at the battery (that is without shortening the battery's life). So, if you need to recharge the house bank faster, get as large a good converter as you can afford and a can of patience. If you put two good chargers on the same bank, one will shut down.
Matt