Certain RV's most certainly do depending on the make and model of the RV. Most luxury RV's tend to be more expensive, but also may include entertainment centers. However you can also add entertainment centers to your RV yourself.
Mainstays Entertainment Centers
There are many stores that sell entertainment centers. Walmart and Target are two stores that sell entertainment centers at low prices with free shipping online. They have many discounts.
BDI Icon Series Entertainment Centers are quite nice. they are slim but can be wide.
For entertainment centers you should look for places online. There you can compare a lot of places to get the best deal. 1 is a great place to start. You will be able to find sofas and loveseats, as well as entertainment centers, end tables and more.
Shopping and entertainment centers
lots of red
Some are imported but most are from UK. The Americans like their RVs however
Sony does provide a 1 year warranty for it's entertainment centers. However if you want to extend your warranty up to 3 years you have to pay for that extra warranty.
IKEA has a HUGE selection of entertainment centers, from small tables to wall-sized units. You have to assemble them yourself, but they are usually reasonably priced and last a long time.
Entertainment centers are widely available at various furniture stores, home improvement stores that carry furniture and furnishings, department stores and mass merchandise stores such as Walmart.
Wooden entertainment centers are generally available at furniture stores. There are some sources that may not come to mind, such as Crate and Barrel or Pottery Barn, and a few unlikely sources like Overstock. One may also wish to check their local CraigsList, if they don't mind previously loved furniture.
One can find information about television entertainment centers at any local store that sells furniture. Places such as Walmart and Big Lots would be excellent sources.