I am installing buck converters to drive the voltage for the mesh hardware from 12v to the native 24 volts expected. I chose the following module on Amazon
One goes to each trailer, and should be able to support up to 3 mesh nodes with the same buck converter. (just hook up the pig tail plugs in parallel). Converter maxes out at 4 amps.
To the output goes connectors; and those connectors go to these in order to inject the POE. https://www.amazon.com/gp/product/B00EBCGJVW/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Tuned to 24 volts and feeding the mesh.