Current single battery and propane, want to go dual

I have the KZ Spree Escape 196 with a similar tongue. I do not think that dual propane tanks will fit but as previously stated a 30 pound single tank may work fine. I also had dual batteries put on when purchased. They basically mount two angle brackets to the top of the tongue instead of the factory mounts being below the tongue for just one battery. Custom enclosed metal battery boxes should work fine too.