Ctek battery quick charger advise please

I have been looking into buying a Ctek battery charger for our Jayco Sterling caravan battery system.
I have no idea what size we would need to buy, is CTEK MXS 5.0 BATTERY CHARGER 12 VOLT 5A enough, CTEK XS 7000 BATTERY CHARGER or do we need CTEK XS 15000 12 VOLT 15AMP or CTEK XS25000 12V 25AMP . I dont understand this lingo, but think it sounds like a great idea to be able to fast charge the battery system when we are free camping for 3 or more days.
Can we install the battery charger ourselves? Do you only attach it when you want to do a quick charge?
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