I spent four months in a van this last summer with a proper black water tank. That makes the experience really easy.
When I was in Arizona & Utah, I was mostly camping out in the wilderness. The rhythm I got into was to pay for an RV park about once a month for luxuries: an uncramped shower, laundry, easy access to empty my tanks. Technically, you can empty your tanks at many gas stations, but I enjoyed the full service amenities of the RV parks.
When I was in a city, I almost always ended up camping at a Walmart and working from a coffee shop. So I used my tanks much less often.
When I was in Arizona & Utah, I was mostly camping out in the wilderness. The rhythm I got into was to pay for an RV park about once a month for luxuries: an uncramped shower, laundry, easy access to empty my tanks. Technically, you can empty your tanks at many gas stations, but I enjoyed the full service amenities of the RV parks.
When I was in a city, I almost always ended up camping at a Walmart and working from a coffee shop. So I used my tanks much less often.