We replaced this:
(slides are in)
with this:
(slides are out)
I put wheels on the couch and it can be turned like this after the slaides are out so we can sit and look directly out the back window or watch the television in comfort:
We loved the new couch so much, we purchased the same identical one, including the rocker recliner, for the house.
We got this at Value City Furniture. I looked for months at different places before finding this one. It met all the conditions. The back come off so it would go in the door, and also creates more space when the slides are in, was comfortable, high back, and recliners. I added wheels so it could be moved and turned inside the camper when the slides are out.
We removed the table and chairs and the original 2 smaller rockers that came with the camper. We Goodwilled the rockers, and the table is in our kitchen in the house, used for our coffee stations. The chairs broke down. They were pretty cheaply made. The didn't hold up to our 20 something son and grand son when they returned home to live with us (for eternity!).
You do not need to go anywhere special to get furniture for your RV. You can replace it with anything. Just figure out what you really want and keep searching for it until you find it. You may even find that "perfect thing" at a yard sale. You just never know.
If you are wanting to replace built in dinettes and such, you are probably best to custom build your own and have an upholstery shop cover some foam cushions for seating.