Hi John, I have my A/C out the front. I used expanded metal on the bottom and will add vents to the top of the sides. I am planning on a Honda 2k generator sitting next to the A/C, so my axle is a little closer to the front than most to keep the tongue weight down. The A/C unit that I have blows almost strait up, no problem with freezing the top of my head… but with a 5200 btu A/C everything might get a little frosty. Good luck with your build. Dan