Cheers guys. I had a look at a few of your set up's and that's exactly what I'm looking to do. Possibly a rhino or similar alloy rack with 2 or 4 lights mounted on the front. I did hear that they were possibly illegal but the police don't seem to enforce it down this way. A member of my local fire brigade has 4 of the 240's on the sports bar of his rodeo and 2 on the bull bar, It's quite impressive to see the light it throws.
I'm rubbish with electrics (cabinet maker by trade) but I assumed that with the stock dual batteries that they would be plenty enough to run the 4-6 lights. But like I said I don't know much about the subject