August 28th 2020 video, at 2:00 mark it shows the older front face vs mat design. I believe the 3120's I have looked at all had the front face and no mat, but I don't know the build dates on those units.
https://youtu.be/oxm268Mjgts
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Old rig: 2005 Ram QC 1500 5.7- Rockwood 8288 4- 6v batteries
New rig: 2016 Ram 25004x4 QC LB & 3120rl legacy-solarflex 300w and 400Ah Battleborn
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