Hello fellow Sonic owner!
As others have said it's a pad to keep the fresh tank warm on cold nights. Our Sonic's are not a true 4 season trailer, but the tank heater will let extend out the camping season for ya through the fall or early spring (depending where ya live).
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2018 Venture Rv Sonic Lite 167VMS
2008 F150 with only 50k miles!!!!
2 Chihuahua's - yeah, were those people at the campground
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