I'm vegan, but I don't have tons of experience with trail cooking yet. On my last trip I tried Mary Jane's Organic dried meal, and I didn't really care for that, and they had too few vegetables.
I rely on whole food vegetables, especially leafy greens, for most of the common vitamins and minerals that are supposedly lacking in vegan diets. Since I don't own a dehydrator yet, I've taken some multivitamin pills with me up till now, but I would like to eventually just take my B12 and Omega 3 (from algae) with me. So if you too rely on food for your vitamins, then I'd recommend a dehydrator, although you might have more to choose from in terms of pre-made dinners where you live.
One thing I've done to up my vegetable intake is to use some dried vegetable soup in a lot of the dishes I make. Red lentils and vegetable soup makes for a really good, super easy meal. Just add both to a plastic bag and when you get to your campsite, throw the amount of water needed in your pot and add the mix to shorten cooking time. Even if you don't pre-soak it it'll still cook pretty quick. I like to eat it with tortillas or something on the side, and add some oil if I've really been at it (I am trying to shed some weight though [whaaa an overweight vegan?!?!?!] so unless I'm particularly famished I don't add any).