I went with two DIY Game Changer 280ah batteries. Did one in April and found out two would fit perfectly.
My RV pulls 2 watts with the battery disconnect set. Batteries drain about 4% per week (inverter off, leveling jacks, propane, victron).
Hope this helps.
P.S. Lithium batteries don't like being store at 100% SOC. They are much more happy between 35-70%
