Speaking for myself, if I had to do a long cross-country trip on a menu as limited as the one you listed, I would probably homestead a Burger King after a week. Seriously, unless you were born without taste buds, your menu will get boring in a week and gag-level in two weeks. Check out Sarbar's site on freezer bag cooking for more ideas on menus and cooking.

BTW, vegetables and fruit supply a lot more to your diet than just fiber. Get a copy of one of Andrew Weil's more recent books to learn how fruits and vegetables supply a lot of important nutrients and phytochemicals.