Thanks guys.
Wolfscout - It won't actually hang below the trailer or be exposed. I am planning an electrical compartment in the front, and just decided that I might use the WFCO rather than the 5A Battery Tender that I have on my current trailer.
The WFCO will be mounted on supports from underneath (not shown below), and the compartment door will be able to flip up and down to allow for access to fuse blocks and other electronics I have planned. I am thinking I will only need minimal access to all this stuff, so I have it tucked under mattress. I will also put vents into this area so the WFCO doesn't overheat.
