Paul, I was not having a go at you mate and I did not mean any disrespect.

I will have to try harder with the wording in my posts.

If it was my truck I would not connect a 12 volt accessory to one battery.

But I understand the cost involved with purchasing reducers, so if someone asked me to wire up their truck in this way I would (I would advise them not to) but it is their truck.

If you do decide to wire it up this way, you could try periodically swapping the batteries from drivers side to passengers side every month or so.

You will also need to make sure you connect the accessory to the correct battery, it is the one where the negative post is connected to the body/block.

Rodney