Quote:
Originally Posted by Rhyno
We have the drains but they are about 5 feet towards the front.
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If you have a "convenience center in the roadside passthrough bay" and your city water connects in that bay, then the direction of flow is from those drains to the island sink, so once the low point drain line freezes, nothing can get past that point to get to the sink. So, there may be "a frozen pipe issue 5 feet forward of the island"....
You might consider wrapping those low point drain lines with some insulation to see if maybe that solves your issue. If it does, then later on, when it's less hassle to get under the trailer, maybe some spray foam or other "heat retaining insulation" that's more permanent than something wrapped around a pipe, as a permanent fix...