I have been to Yellowstone twice. Yellowstone is difficult because you will want wide angle to at least 400mm. You can be shooting a landscape image and all of a sudden, you pick up a grizzly, fox, elk, deer, wolf, etc. in the distance and you need more reach.
The first time I rented a Tamron 18-400. The second time I brought 3 lenses I own to cover 16-800mm (with a 1.4 TC). Since I was traveling with family, the Tamron 18-400 was so much easier. I also think that it took very good images and unless I pixel peeked, it was hard to tell the difference between most images. If you are going to produce wall hangers, take multiple lenses. If you are going to explore and be amazed at what you see, travel light. Anywhere you go in the park will provide ample scenery and wildlife to fill your memory card with images.
I use a Topeak MRX Trunk bag on a rack on the back of my bike. It will hold my body (Nikon D500) and a Sigma 15-600 Cont. lens (disconnected from body). If you use the side panniers, you could fit a ton of gear. The main compartment is pretty well protected if you fall but the panniers are subject to impact.
I have the Camranger 2 which works well for what you want to do but, to be honest, I end up using my Pixel tw-283 remote shutter release more often.