I’m surprised GC2 standards are too tall. The Interstates in our coach lasted 12 years, basically charged by solar while parked by the house here, often for years without moving. But I too got tired of the corrosion, and replaced them with AGMs. Lithiums were too expensive and required $$$ in component changes aside from the batteries themselves.
But the inverter and solar system hasn’t played that great with AGMs. The Magnum inverter remote is just barely configured for handling them, and had to be set differently. Ever since then the remote would come up with unusual readouts. I had to get Magnum help several times, and it still behaved erattically. The solar controller was not built as per its manufacturer’s documents, so resetting it for AGMs was a headache to determine, and I’m not certain I ever got that right. It wasn’t really made for AGMs apparently. I intended, if we could just get back on the road again, to have an updated solar system installed. A new inverter remote would help too.
Your older coach may or may not encounter similar issues with AGMs. I can say that indeed there is no corrosion problems anymore, and of course no rewatering hassles. But I’d still check your infrastructure compatibility first. You may still opt for wet cells. A straight up, tit-for-tat replacement proffers the least headaches. I myself would’ve otherwise got the GC2s at Costco, the best deal on Interstates, considering I got 12 years out the original Interstates.
Joel