Battery box for 3 Battle Born batteries on trailer

I am going to be purchasing a new travel trailer that currently has a battery box on the front of the trailer and holds 2 lead acid batteries. Was wondering if anyone knows of a battery case/box that would hold 3 Battle Born batteries. Since the dimensions of lithium batteries seem to be smaller, was hoping to increase my overall storage for boondocki

If no such animal exists, I could always put the batteries inside the trailer/RV. Thoughts were to better use the existing battery area as my first attempt to preserve as much interior space as possible.

Welcome to the forum.

I would be inclined to put $3000 worth of batteries in a more secure location and provide additional protection from the elements.