Cammie and Bill,
Welcome to the forum and to the Ranger Tug family! You are in the right place to ask questions. But I have some suggestions. First, you may get the most helpful responses by posting your questions one at a time, at least for things as different as your toilet and the gfi tripping on your outlets. Also, give a few details specific as part of the question. Like, for the toilet, what year tug do you have and what model toilet? We don't all have the same "head" unit, and different ones flush using different cycles. The configurations of our boats can vary a lot -- for example, ours does not have a generator, and we've never had a problem with our outlets tripping. But others with generators may. A post directed to that specific problem may draw more responses.
As for a Manual, look under the Ranger Tug Factory Support forum, and then the technical bulletins sub forum. Manuals for several of the models are there. They give you very basic information. Not any real "how to." But you can get a lot of the hands on advice you may be looking for from the other owners on this forum.
Again, welcome aboard!
- Gini