Folks swap out RV furniture quite often. If you can get the "old" out of the door, you will have it licked!
There are folks who have knocked the Thomas Payne furniture, but we have 2 pull-out sofa beds and one dual seating theater seat with power recliner, also has built in USB power supplies. We've had this camper for almost a year now, and we've had no issues with the furniture. Thomas Payne is, more than likely, the furniture you'll get in a new RV. The nice thing about the Thomas Payne RV furniture is the fact it all comes in parts, making everything easy to get in and out of the RV door. The parts just snap or hook together.
But, there is nothing wrong with getting true house-hold furniture either from a furniture store. You just have to make sure the item will fit through your RV door, make the necessary turns, and be able to position in the right spot. We swapped out two rocker and the kitchen table in our previous TT for a true 3 seater, recliner couch. The backs removed, making it possible to get inside the camper. But when we sold the camper, I left the couch in it.
Here again, if you can get the old out, you can replace with anything that fits through the door. Do your homework first ... lots of measuring if you purchase from a furniture store or on-line.