Cate&Rob -- so I started back at square 1. Usually when doing something new (to me) I find out it's me making a mistake that's the issue, so I double-checked my process.
Sure enough, I was checking the tank pressure with water pressure applied to the camper. Dumb--the value I was reading was not the pre-charge value (what I was attempting to measure). After draining the lines (removing water pressure) I found the pre-charge was only 4 psi. Doh!
Set the pre-charge (again) to 58 psi (correctly, this time) and restarted the test.
Sure enough, I was checking the tank pressure with water pressure applied to the camper. Dumb--the value I was reading was not the pre-charge value (what I was attempting to measure). After draining the lines (removing water pressure) I found the pre-charge was only 4 psi. Doh!
Set the pre-charge (again) to 58 psi (correctly, this time) and restarted the test.
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