Do you have advice on endurance based nutrition?

You'll want to make sure you get enough of the good fats, monounsaturated or polyunsaturated. Olive oils, nuts, seeds, peanut butter, avocados are all examples of good fats. Fat, as you know, gets stored so when you are on a long walk your body can take away the fats that become stored and use them when needed. Also, the fats take longer to break down into gluclose, used for muscle energy. You can refer to a glycemic index on how fast certain foods break down.
In short don't be afraid of the fats, they will give you energy throughout your hikes. I tell all my clients to try and keep their carbs below 75 grams. You could get away with twice that. Your body will burn through the carbs right away then slowly start turning those fats to gluclose.