We're campers, too, but didn't get to make our first trip quite so early (that would have been Xmas time for us!). We started around 9 or 10 months, so some of this may work, some may be irrelevant.
The warm jammies someone recommended are a must. It gets cold at night most places, even in summer. And the stores don't sell fleece jammies a lot in summer, so I went to consignment stores (where I shop a lot anyway) and got fleece jammies in the current and slightly bigger size so I was prepared, as well as a larger sleep sack. It was pretty chilly at night when we camped (Memorial Day weekend), so I bundled a lot: fleece jammimes with socks, fleece sleep sack, fleece coat, and fleece hat. My baby sleeps better warmer rather than colder.
Also, we brought the port-a-crib both traveling and camping, but didn't always end up using it because she would get too cold. We've started using an air mattress when we camp (as we get older and for the baby), and so I laid a waterproof pad down (for insulation as much as a wetness barrier) and then laid her on top of that in between us in the "bed" and if it seemed really cold, then I covered the bottom half of her with our blankets.
As far as travel, I understand the mom who said not to push it past ten and then expect baby to go back to sleep immediately when moved into the hotel. We tried it on the other end--getting up early and driving. Our baby stayed awake a bit, but then slept for a good long time. I understand your concerns about not wanting to wear out you or your hubby by driving through the night, but maybe driving a bit into the night or leaving early in the morning could help. You could also plan flexibly--thinking you'll try to do the all-in-one day, but having a backup plan of stopping overnight at X, Y, or Z, depending on how things are going? If that's possible, always good to have alternatives.
Even if you don't use it at bedtime, pack-and-play type of things are really nice to have a safe place to lay baby down for naps or just to play when you're cooking or putting up the tent. At that age they're not really moving around TOO much, if memory serves, but we would also let our baby explore the tent, crawling around in that enclosed space (with one of us) when she was tired of being carried and didn't want to be limited to the playpen. Once I brought our stroller with us, and that was a treat, too. Then I could take her for walks easier. Just depends how much space you have.
Good luck and happy camping!