First thing is to train your pup. Both basic commands and boundaries. A well trained dog is much easier to travel with and you and your pup will have a more relaxing and pleasurable time. Be sure to give lots of immediate praise when they do well, it reinforces good behavior. You have a very high energy breed, they can be trained but you have to plan for a release of that energy too.
I have always loved traveling with my pups, hunting, fishing, ATV, hiking, 4 wheeling, camping etc.
You didn't say where your destination is. Remote camping or KOA? This has a big affect on the answers you get.
I remote camp and have traveled with my dogs for decades and rarely ever need a leash but I always have one just in case. If you have to use a leash then a 6ft lead would be fine for setting up camp, be sure they can see you it will keep them calmer. A 20 ft lead may be nice until your pup gets it wrapped around every tire, chair leg and tree in sight then you have a 6" lead left over, so make sure they're is a clear area for them to move around with out getting tangled. Remember there are concessions you have to make to travel with your fury friend. If hot out you have to park in shade at minimum and maybe not do whatever it is so they don't have to stay in a hot car. That may mean your friends go to a restaurant for dinner but you go to a field and run your pup instead.
Never let your dog sleep outside tethered. Let them sleep in the tent/camper etc with you. A tethered dog is easy prey for predators. If this is your plan maybe doggie daycare is a better choice. I had a Golden Retriever who would open the zippers on the tent after I went to sleep and go sleep outside, but never on a tether. I usually let them out early in the am and go back to sleep for a bit longer and let them explore some and go potty.... This hasn't ever been an issue since my dogs don't run off.
Darrell