Thank you very much. It depends...
If I'm not expecting good graze and I'm taking pack stock I'll take what I've always referred to as TACO (Which is timothy, alfalfa, corn, and oats ground and formed into a large pellet.) as well as cubed hay. I figure that the cubes will take care of the roughage and the rest will put energy into the horses. Sounds kind of similar to what joe4d does but my setup takes more weight and room (thus the pack critter). I've never been a big fan of the beet pulp but that's just me.
If I can be reasonably assured of good graze I'll take a few pounds per day of a complete feed (generally a senior feed) and use it as essentially catch grain. Of course this scenario has the horses in hobbles and grazing for an hour or so morning, noon, and evening.
If I'm not expecting good graze and a pack animal is out of the question I don't go.
Some of the old timers say that I pamper my beasts but I figure they need to enjoy their trips as much as I do, so I don't mind putting more food into them.
Hope this answers your question.