Based on my limited meandering experience with posting/editing videos here is what I would do with this video:
NOTE: I am going to be as forthright and blunt as possible because I know with my videos it is really difficult to get constructive criticism and it's something I know I really want to make my videos better. People just tell me "I liked it" and that's nice to hear but not very helpful if I want to make better videos. This is my gift to you
1. The audio is a bit all over the place. Normalize if you can but for sure turn down the music. I usually run the music on my videos at 33% and I like to fade them in.
2. Write up a script for your voice overs. It just makes things flow better and makes sure you don't have any empty space or sidetracks
3. Dashcam video is good but if you have someone running a camera who isn't the driver (I'm never lucky enough for that) make sure they get different shots that aren't pointing forward. There were some out the window side and back shots but a lot of it was pointing forward.
4. Speaking of dashcam shots. I try to never go over 10 seconds for those before switching unless something is happening (like that bird flying by) unless you are doing a raw video, then just do nothing but the dashcam. This is a hard thing to do, I know. I could watch my dash videos all day. It's fun to relive trips that way but if you weren't there these can kind of drag and that's the last thing you want if you want people not to click away.
5. I really liked the shot from 6:20. Again, if you have someone who is willing to film while you drive that is solid gold. Kick them out of the cab as often as is reasonable.
6. Never show multiple angles of the same event unless it is REALLY interesting. Like parts ripping off interesting. The one possible exception to that is when you are doing picture-in-picture or split screen stuff and I've found the work to get it to sync right is rarely worth the end result.
7. Consider using transitions like fading to black between sections. This helps break up the video so that instead of watching one long video the viewer is watching a bunch of short ones.
8. Buy a drone. You cannot go wrong with drone shots. They are always fantastic and really make your videos look a lot more professional. Can't fly thing in national parks thoug...so this comment is pretty useless. Sorry.
9. Were I making this video I would have cut out about 50% or more of the dash cam/forward facing video. It's too much.
10. The map at the start when you are doing your V/O is good but it's too zoomed in for me to be able to tell where the heck you are and it's up for too short of a time for it to really register.
11. If you took some good pictures while you were up there consider adding them in to break up the video a bit. I find 3-4 seconds is a good amount of time for a picture to be onscreen
12. Title is a bit long. And in my mind I would hesitate to use "off-road" and "national park" in the same sentance as people could assume you were tearing it up on fields. How about: Backcountry exploring Sheep Mountain Table in Badlands National Park
13. Ghost ride ya whip...Haha, no, no don't ever do that.
I hope that was helpful.