Bill,
Yes, I remember reading that info thread. I didn't think I'd need it this soon.
Based on the reviews, even for the one you referenced, I felt it was too risky a buy from Amazon. Plus, something with the ability to measure mV to diagnose parasitic drains would be useful. So, I got this locally:
https://m.kmstools.com/klein-tools-4...p-meter-169424
If anything goes wrong, I can take it back far more easily then I could with an Amazon order.
I haven't used it on the trailer yet. Before I do, I'm going to make sure the brakes are set up right and lube the wheel bearings. They may just need setting up.