Sounds like you bought a camper you didn’t like. That happens. Most RVers go through a few models or types to find what works for them.
The question is “do you want to suffer through it and make changes”? If yes, we can discuss potential solutions for remaining issues. If not, why not trade it to get something you like?
If you truck isn’t lifted, it may be possible to adjust the jacks to lift higher. I’ve never heard of trucks being too tall otherwise. Even the tall Ford F350s work with all TCs as far as I’ve heard. That seems to be something the dealer should have handled if you truck isn’t lifted.
My TC has a small step attached to the cabinet on one side. It’s barely big enough for a foot, but works just fine for my 5’2” wife to make getting in/out easier.
Don’t put heavy stuff in the back cabinets, but that is plenty of usable space for lighter items which I’m sure you carry. There are a few solutions for hard to reach in cabinets. 1)Add sliding shelves to the bottoms. 2)Add a rotating shelf like a lazy susan. 3)Add baskets that can be pulled out.
Remove the microwave if you’ll never use it. Consider adding a Convection microwave for short uses. They get really hot and I don’t think they are a full replacement for an oven.
As far as weight goes, that’s an issue for almost everyone. Either the TC comes in heavier than expected or the owner underestimates how much they will be carrying. That’s why you see so many DRWs here.
Good luck.