A high amp charger powered by a generator would be fine since on day 5 you get to go home and plug in and get to 100% charged, however long it takes, and it takes a long time after many cycles without a full recharge.
The successive 50 to 80% charges cause the batteries to lose capacity slowly, as they want that 100%, but only 3 or 4 50% to 80% you should be good to go.
Making sure your charging source seeks and holds 14.4v+ whenever the generator is running will be paramount. Your Wfco will not do this, happily wasting gasohol seeking only 13.8v.
I use a meanwell rsp-500-15 which is capable of delivering 40 amps upto any voltage I choose between 13.12v and 19.23v. Right now it feeds only a single 90Ah Northstar AGM battery which has no issues with high charge rates.
80% to a true 100% takes 3.5 hours on this battery when held at 14.5v.
With more cycles without reaching 100% or with low and slow solar as the only charging source, 80 to 100% takes considerably longer as this particular battery wants the occasional high amp recharge from its most depleted state.
