You'll need an extra battery cable to tie the positive of one battery to the negative of the other.
Also, you'll need to add a second battery box, or replace the one you have with one that holds two batteries. Just make sure they are vented out the bottom of the rig and out the front (natural draft) so that no hydrogen migrates into the compartment.
Blue Sea makes a great box to secure those batteries, but it is for marine and does not have the vents (marine bilge and engines are mechanically ventilated). I had to cut a hole out the bottom and a new hole out the bottom of the compartment deck and stick a vent tube in there (I used the old tube off the old battery box). I also cut a hole in the lid and used the old battery box vent tube to make a flange to attach the upper hose. I have some pics in my mod section.
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