"Bonking out" at one hour is not not due to the lack of food. It's the lack of training. Your body should have enough muscle glycogen to fuel 2 hours work without eating anything.

Obviously good nutrition is important to your training, and eating better will help your fitness, but I doubt it's the answer to this specific problem.

Also 5'10" 180lbs is a bit heavy for bike racing, so you want to be running a slight calorie deficit. It's difficult to lose weight while training hard, so you should shoot for no more than a pound a week in season, or a 500 calorie deficit.