I noticed this yesterday and fixed it right away, just wanted to get the word out. Yesterday morning while brushing off the battery box and other parts due to all the tree pollen and such.I noticed the battery box moved on its mount. Realizing it was not secured to the rails with anything more than a strap I moved it back to its original location and noticed water sloshing out. After removing the lid, I realized the battery box was full of water. Seems these new boxes have vents in the top and no drain holes in the bottom. I do not think electricity and water should mix, so I put a few strategic drain holes in the bottom, and whileI was in there, Isecured the box to the frame, so it can't slide around.
I hope this helps anyone who may have purchased a new trailer, and didn't think to check the battery box
Jason & Wendy
2014 Ford F-350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16K Fifth Wheel Hitch