Can you share some more info on what the backpacking trip will be like? From your description, it sounds like you will have flexibility in your schedule to incorporate training during the trip???
The main thing that jumps out at me is you’re planning on doing what appears to be a fairly significant backpacking trip and then shortly afterwards going into the ultra:
1) How to incorporate muscular endurance workouts during the trip
2) Depending on the scope of your trip, what is the potential that you’ll be outright tired/fatigued upon returning?
I’ve asked the other moderators/coaches to chime in as well but at the moment, your summer/fall plan seems very ambitious and I would be concerned about proper rest/recovery