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Do you have residential frig? That will drain power fast. We have the same battery power issue. We have upgraded batteries and it didn't help. The truck will charge the batteries, but not enough to help the batteries without hooking to shore power. With all the new electronics in the units there is a constant drain on the battery. When we would put the RV in storage for several weeks we would turn the batteries off, but they were still drained because of the electronics still running. The only thing we have found is to disconnect the batteries completely. We have a Jayco Pinnacle 2020. In the battery compartment there are two switches we disconnect (complete battery disconnect) when we aren't going to be using the RV for several weeks then the batteries do stay charged. We will be traveling to AZ in a few weeks. It will take us 4 days and the batteries will be dead 2 days on the road. Since it is winter, we are winterized and will be staying in motels and not hooking up to shore power.
When the batteries were completely dead, hooking up to the truck won't charge fast enough to work slides or landing gear. You will have to hook up to shore power.
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