I think like humans, dogs get excited when placed in a new environment. They have better hearing and smell than we do so the new noises and smells can be disturbing until they get used to it.
The two dogs we had would start calming down after the second day in the same place. One thing that worked is frequent or long walks. They would be tired and nap.
The howling when left alone is hard to stop. Some have had luck with the shocking collars. Our dog trainer suggested using a metal lunchbox with some stones in it. It requires some time to take effect. Leave a window open where you can toss in the lunchbox. Act like you're leaving, one of you stays out of sight by the RV the other drives off or walks off. If the dog begins to howl the person on the outside in a stern voice says the dogs name followed by "No" and then toss in the metal lunchbox. Make sure you use a window that is away from where the dog normally is located and one they can't get out of.
We used a window next to our kitchen sink so the lunchbox would fall in the sink.
It took about two weeks for both dogs to stop. This same technique can be used to stop other behaviors...it's real effective for keeping dogs from running out an open door.