I have a 2013 RoadTrek Adventurous RS, Sprinter 3500 chassis. When my house batteries stopped charging while driving, I diagnosed it to a bad battery isolator. I have dual Trojan flooded 200AH 6V batteries, connected in series, rated at a maximum charge rate of 20 amps. The cores have been getting warped, so while testing the new isolator, I measured the amps going from the alternator to house batteries, discharged to 12.5V. The charge rate from the alternator started at over 60 amps, falling within a minute to 45 amps and settling in at 40 amps. This is a sustained charge rate of 2x and momentary 3x the maximum charge rate! Did I buy the wrong replacement batteries or is this a design flaw in my 10 year old RoadTrek? A DC-DC charger would be today's best practices, but there isn't room to swap one in where the isolator is. Is my best solution to find a replacement battery that can handle a faster charge rate?