In a jeep you need to be thrifty with your space. However, I got a Pioneer head unit, 4 5'' Memphis Audio components, and a 10'' kicker L5 with 300 watt Kicker amp in a 2009 Jeep Wrangler 2dr.
In my Ford Focus I have a Pionner head unit, 4 5x7 pioneer components and a 10'' JL W6v2