Can I put a little baking soda in my TT toilet?

If you have an odor problem it is from a reason. If you bought your unit new and have been using chemicals in the toilet to break down the solids, then you might have a problem with your breather pipe that goes to the roof not venting. If that is not the case I would put some chemicals in the toilet, drive around for awhile with the tank about 1/2 full of water and then dump. You can add baking soda if you want. It is great as an order eliminator, but will not break down the tissue and solids.