on my last trailer I modded my batteries from one 12volt to two 6 volts plumed as a 12 volt mated to another 12 volt!
so I pulled the single battery out and started the fab that has to be done to make them all fit.
the L bracket is thin by any standards so it will be replaced with 1/4" L channel steel then a 1/4" board on the bottom.
now all i need is a duel 6 volt battery box and im in business.