Saying your batteries are new doesn't mean much. Need to have a multimeter and make some measurements. Our batteries get run down some when we are camping and in your case a good battery boost may be in order to recoup your couple of days of camping...
Just yesterday our truck started showing LOW TIRE PRESSURE alarm on the console so I get my portable 12V tankless air compressor out from under the back seat to bring up the pressure in all of the tires as needed. This happens alot for us when the outside temps get real cold which affects the tire pressure sometimes to trip the low tire pressure alert on my truck console. My 12V tankless compressor was struggling to even get the tires up a few lbs and then I noticed the truck voltmeter was way down when running the compressor...
Kicked in a boost charge and the compressor jumps to life haha...
MS KARMA lives for these events haha. She knows exactly when to hit you with problems hehe... The trick is stay ahead of her if you can with good PLAN-Bs...
Roy Ken