Your generator is adequate but it takes a long time to fully charge RV batteries...bulk is fast but absorption phase to float....2 to 3 hours. The “power” of your recharging system isn’t usually the limiting factor. Batteries accept less and less as they fill. Solar would be far easier.
Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad