I have a 2015 Jeep Wrangler Rubicon JK 2 door with 35" tires. I have electric lockers, so, don't need air for lockers. I find that I don't have a lot of room in the back of the jeep when we go on the road. Would anyone recommend a dual ARB or single ARB solution mounted in the engine compartment?
We absolutely love our dual ARB compressor. Yes, it is a big investment on the front end, but the output and reliability is incredible. I can bring up 6, 33" tires (we have a trailer) from 16 PSI to 35 PSI in about 7 minutes. (More or less depending on altitude, temp, and humidity.)
You can mount them in the engine compartment, but I highly recommend you mount it somewhere that's not exposed to the elements and heat wash of the engine. It will degrade the components faster as well as reduce the output since the compressor will already be hot when you want to air up. I'm not sure who makes it (not a Jeep guy), but there is a bracket that will allow you to mount it under the passenger seat to fix this issue. I can ask my friend where he got his if you're interested.