I would figure out the drain first then buy a new battiery (AGM) if it was me. You killed the battery twice and it seems to be draining fast so perhaps its just a battery problem?
I would test after one week of sitting to see if it will start.
Check battery with multi meter for draws and current voltage at rest. You can then plug the RV in to 120 AC and see if it charging too.
Plus once it starts up see if the alt is charging batt.
Many youtube videos on using Mutli Meter. Im just learning how to use one myself so Im not sure off hand on how do do all of that off hand - I just tinker with it until I get some results - Perhaps someone else can chime in to help you.
Youtube is my GOTO for stuff like this.
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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