Me either. About 85 days is the longest, but we did live in our Bigfoot pickup camper for 4 months. We also lived in a tent for 3 months each year for several years.
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Randy & Barb
1998 C 2500 (Cruncher) and 2021 Ranger (Yoda)
What we do when the sensors in the black or grey tank start staying lit even though the tank is empty is partially filling the tank to at least the half way point and adding two cups of dishwasher detergent and then driving around for a while. We do this every few camping trips usually on the way home. The dishwasher detergent doesn't foam and seems to do a decent job getting the tank and sensors cleaned up. So far the sensors work properly after this treatment.