Winnebago has had them as an optional upgrade on their Views/Navions for a couple of years. Standard batteries are AGMs, or upgrade to lithium, for a few dollars more (~ $5000?). It became an option when the new flat top cab over was added. Same year.
Winnebago used the Zamp Solar Charge Controllers ZS-30A in my 2018 Navion. It came with a pair of cheap FLA batteries, but the solar CC has an LiFePO4 charging algorithm, which is almost the same as the AGM charging algorithm. I use it now, after swapping in a couple of Relion 100Ah RB100-LT lithium batteries back in 2019. Works just fine. I also have a Progressive Dynamics PD9245 converter/charger, to which I added a Charge Wizard remote control pendant. With it, I can manually boost the charging current to the lithiums when I'm plugged in, if they need it.