Leave them all wired up and just charge them with the rig's converter, using either shore power or generator power. No need to take them inside for the winter unless you have no shore power over the winter. the converter will look after them.
How many watts is the inverter-generator you bought after the previous thread of yours on that? That will be your limiter on how big in amps of a charger/converter you can run with it.
If you do take the batts inside for the winter, you will need a "maintenance charger"--usually about 2 amps that holds a steady voltage like 13.4v the whole time it is plugged in. (DO NOT get a "manual" "trickle charger" for that job! It will let the voltage climb way high, and overcharge the batteries.)
EDIT--Roy, to repeat myself here on your question, a 50-90 on 440AH with a 55 amp charger will take about 106 minutes for the bulk stage. At about 72% SOC, amps will taper for the absorption stage, that will take about 172 minutes. So total time will be about 4.6 hours.
If you want to do it in 3 hours you will need to do just 50-80s instead of 50-90s, or try 40-80s if you need the AHs. If you had more generator, you could go to higher amps charging to get a faster recharge.
The four batts will not "demand" a limited amount of amps in bulk. Forget that notion, please :( The 440AH bank will "accept" at least 160 amps at 50% no sweat, so don't worry about that.