There is a big difference between what you need and what you think you need and what others think you need.
If you are an experienced camper you should know your "electric only" needs.
If I were trying off grid TT camping for the first time I would go to a nice campground and just not plug in or borrow or rent a generator.
I have done a lot of wilderness tent camping and have overnighted in the TT without shore power. There is nothing special about doing it; if you like camping with limited power. Some do, some do not.
If you are one of those that do like it. You will know what you really need in a few trips. If it turns out you do not like it you have not bought stuff you will seldom use again.
There are a few spots out West where I would consider boondocking for a few days, simple because there is no other way to see them.