We have had a few dogs over the last (many many) years and the dogs were all ... well ... just plain nuts! We took them with us camping and exposed them to everything. Now please understand! Listen Carefully! .... It took WORK! Lots of WORK! 100% attention!
But, we exposed the dogs to 100% over-stimulation! The noise, the traffic, the people, other pets, constant changing environments, motion, things going on, constantly something happening. All day, and lots of noises all night Yes! Every dog we've had ... at first ... goes ape-nuts! Want to bark at everything, chase everything, and play with everything. But soon find it absolutely impossible to keep up with everything and literally exhaust themselves with over stimulation!
After about the 3rd time camping, they mellow down and eventually, absolutely NOTHING excites them any more!
Time, work, constant attention, and it pays off. Take the dog for car rides, let him go with you everywhere you go. Let him out of the car, even if just a parking lot. Play, play, play! But the secret is 100% stimulation, so much exercise, so much excitement, so much exposure to new things, and everything constantly changing... and they literally will give up!
Then they turn into really GREAT camping dogs, and now we work very hard to keep everything calm and peaceful. We have always had GREAT camping dogs, but it took work to get them there!