Without a single doubt at the point of Rolls, even Crown...with the brain engaged just go buy Battle Born LFP and be done with it. Save weight, all the benefits. When you get to the cost level of Rolls/Surette and Crown why even think about it, get on board with LiFeP04 and enjoy the new world, no more electrolyte levels to check, fast recharge, use down to 10% SOC. Why would you even mention high dollar FLA batteries in the world of LFP. I'm certain they have a place, in an outdated PBX backup array or some forgotten railroad install but hardly in a new RV. In a new RV most of us would simply go LFP and be done with it for about 10 years and save the hassle and weight, boondock freely. Yeah, even the old days of PBX are essentially gone. Now you have IP phones throughout the company - no longer a human answers the phone even - all phone tree through a computer on an IP phone so where's that big array of Rolls/Surrette battery? No longer a player at all.
I just don't know why and can't imagine any discussion today about high dollar FLA batteries being had without the proverbial tongue in cheek or the bottom of a bottle of cheap whiskey staring back at the speaker. Any man with a good bottle of spirits is still sipping it and saying calmly - "now back in 2019 I remember installing my first set of Battle Born LFP". Actually I would even make that argument when considering Lifeline AGM vs Battle Born today. GO LFP!