Welcome to the Forum!
Pivoting seats are readily available across Thor's model line-up...
Which models are you looking at?
(It might be easier to climb up into a Class C...)
Shower sizes vary by quite a lot... If you go to Thor's website: you should be able to get an idea of which models have the larger ones...
(Usually: it'll be the Class A rigs.)
A step up to the toilet?
That's a good question!
Our 29-H Outlaw didn't have one... but a lot of models do. It might be dependent upon where the toilet is located, in relation to the Black tank...
Good luck, and Happy Shopping!