I'm using a Projecta DBC150 as the isolator and a Optima D31 marine Blue Top as the deep cycle battery.
it's mounted in the rear beneath the drivers side roll cage, up and out of the way. Mounted an ARB dual compressor on the pax side under the roll cage. It's wasted space so I might as well use it to the max.
It's mounted via a Springtail Solutions MOLLE rack.