A few things about your route: If it works for you and you have never ridden up to Tobermory and taken the ferry across to Manitoulin Island, I would suggest that. It will allow you to ride on #6 north out of the island towards Espanola which is an amazing ride in the summer and will link you right up to the Trans Canada Highway. The ride across the north shore of Lake Superior is really nice with places to stay along the way - camping or motels. Once you are down in Arizona, the 89A between Flagstaff and Prescott is an amazing road. That is a such a beautiful state! After you run into the deep south think about coming home via Alabama and stopping in at the Barber Museum - it's a moto heaven. Then from there, pass through Deals Gap and then ride the Smoky Mountains and the Blue Ridge Parkway all the way north. If you are a CAA member, you can get free maps of every state and Canada. Don't forget to get good travel medical insurance.
For veggie food, I don't eat meat and without knowing where the good local spots are along the way, I now defer back to Subway. I grab a foot long for lunch and only eat half. Then ride until evening and eat the other half for dinner. Cheap and easy and I always know what to expect. When I was down in Alabama and Mississippi, I have stopped into restaurants when riding and since there were no veggie mains on the menu I ordered just sides of veggies and sometimes they come in meat broth/gravy. So now I just do the Subway thing. I stop in to grocery stores and grab a few apples or fruits and trail mix to keep as snacks. I will also say that sometimes I have been told of amazing places by locals in whatever town I am passing through, or Google is your friend.
For luggage, my preference is towards the Givi E41's, because they have a small combination lock top door that allows for easy access to smaller items. They aren't the best looking cases, but they are very strong and withstand many a dropped bike. For a tank bag, I prefer the ones that lock onto the tank, so they are elevated off the tank and allow for quick removal, as opposed others that use magnets or straps and often scratch the bike in some way. I have a Givi tank lock bag that I like very much. Some have map pockets and some have wiring capabilities to help facilitate hard wiring your devices into the bike. If I am riding on a trip and packing light, then I don't bring the side cases and go with just a top case and a 55L dry bag on the passenger seat which acts as a backrest.
For moto gear, if you don't already, you might be well served with a 3 season type jacket/pants that allows you to stay warm in the cool mornings with liners, and then has zippered vents for air flow during the hot mid day portions. I would also suggest a hydration knapsack like a camelback that will allow you to drink whenever you feel like it while on the road. It helps if you have good rain gear.
For inner gear since you are going for 6 weeks I would suggest not packing too light. Know that it can be quite cool in the mornings along the north shore of Lake Superior even in summer. I like wearing Bamboo or Eucalyptus tops because they are super soft on the skin and naturally antibacterial. You can also get athletic wear that is moisture wicking to wear as your base layer. I personally like Brubeck long sleeved athletic tops for all season riding and long distance touring - keeps me cool in the summer and warm in the winter. Bring clothes that are easy to wash/dry, so if you need to wash a shirt in a sink it will dry out fast - and the moisture wicking materials are usually much better for this than materials like cotton. They also pack down really small and are very light. For jeans/pants, I would bring pants that have zippers at the knees, so I could wear them as pants if I need to or wear them as shorts, so I get the benefit of both and saves space. Marks Work Wearhouse usually has some decent ones that pack really light.
So for 6 weeks I would pack something like:
3 thin riding socks + 3 casual socks
2 zippered pants
sandals and 1 pr
4 casual t-shirts
2 long sleeved riding shirts
Electronics (mp3, phone, gps, chargers)
Copies of your ID and some spare cash hidden on your bike
Rok Straps, tools, chain lube
Small towel for windscreen and helmet visor cleaning
Grocery bag to store dirty laundry in
I'm sure there is more - I'm in Mississauga if you ever need more tips.
You will find a wealth of info about routes and roads in a thread I started a long time ago here: Re: The best roads/routes in Ontario/Quebec/U.S.