I have 4 Interstate golf cart batteries plus the start battery. When I boone dock, like in WY I have no problem. In the morning I have about 3/4 (approx) left. If your batteries are under the step add the 2 extra batteries in the compartment next to it. Once you drain batteries below 50% their life is shortened. I suspect your batteries have shortened their life quite a bit if you fully drain them every night. I run my thermostat at 68 at night. I also use a portable 120 watt solar panel. I point it east before I go to bed at night. Quartzsite is not really cold at night We camp in areas of Utah and Wyoming down to almost zero. My furness runs all night long. I'm 75 and I want warm.
Check the SG of your present batteries. You may need to buy 4 new batteries. You may also want to switch over to led lights or really be careful how many lights you use in the evening. Take care of those batteries and they will take care of you.
