Had some batteries recommended to me from Mo and BRM "US brand batteries" doing the specs on batteries the two I'm looking at are.

Us185 E @25amps 355 minutes
L 15 5/8 W 7 1/16 H 14 7/8
105lbs. $210.93 + $30 core charge
$6 shipping to buisness

Us 12v xc2 @25 amps 292
L 13 1/8 W 7 1/16 H 11 3/8
86lbs. $153.00 $20 core charge
$6 shipping to businesses in truck route.

These big batteries will take a lot of charge I'm sure. I have an onboard charger 210d minn kota two bank 5amp per bank. With two batteries staggered 24volt could I hook car charger to pos on one battery negative to other battery on say 10amp 20amp or 40amp charge to charge over night faster? Other words running two chargers at once onboard and car charger? Have done it on previous 12 volt setup with same kinda onboard charger and car charger on different boat but not sure about 24 volt or if it'd hurt batteries?
Eventually gonna buy 3bank 15amp per bank onboard charger but for now can this work?