Is this normal?

Hi. I just bought a used 2012 Ram 1500 Laramie Crew Cab. After driving it the other day, I noticed that the hood seemed to bounce up and down when driving at highway speeds, like it was loose. When I opened the hood to untwist the two large plastic screws near the front that tighten the hood, I noticed that one of the metal tubes crossing in front of the engine was completely wet with condensation. I don't know a thing about engines, but is this normal after 5 minutes of driving with the AC on low? The outside temperature was about 85 degrees F.