To deal with the issue of fully charging my golf cart batteries, I installed a DC to DC charger with a 2awg welding cable from truck batteries. Installed a quick disconnect like the ones used on fork lift.
The unit is the CTEK DS250 dual with the smart charger. This combination allows me quickly charge low house batteries when the truck batteries are fully charged by adjusting the output voltage based on the state of the batteries. It will back off the charge automatically as the batteries approach a full charge.
When I first installed the charger the house batteries where at around 60% charge and my truck alternator was putting out 60A to house batteries. The output is automatically adjusted as the house batteries % increase. The other benefit is that the voltage output is adjusted based on the state of charge of house batteries independently of the truck batteries.
Its also a battery Isolator with a built in 20A solar charge if you have solar panels. And the solar charger will also charge your truck batteries when the house batteries are charged.
My converter only charges at 30 to 35 Amps so charging with a generator will actually take longer. I rarely take generator along. By the time we arrive at the campsite batteries are at full charge.
