Hello, Scott, and welcome to the forum.
We use a voltmeter for our trailer plugged into a 12v accessory outlet. Knowing the battery voltage, and charging voltage, is an easy first step, very inexpensive, and an order of magnitude better than the (virtually useless) battery level lights.
For the fresh, grey, and black tanks there are level indicators that are better than the factory ones. Some of those are expensive and some folks report that they get fouled and may not be much better than the factory indicators.
You'll probably hear from folks on this site that have better monitors and what their experience has been.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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