I use one of the HF chargers too. I have measured it MANY times, and I continue to measure it often (I was always taught "Trust, but verify" and my trust in cheap tools is thin). It has always put out a nice float level of 13.2V. Though I smelled something funny in the garage this morning leaving for work, so I'll have to check up on that battery.
That being said, if I were able to plug my trailer in while in storage, I would just depend on the built-in charger to maintain the battery, as I have verified that it is in fact a multi-stage charger, and have also verified its voltage output at all stages.
If your trailer is older and does not have a multi-stage charger, I would not leave the battery plugged into it.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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