While researching for my non-fiction book 19th Century Carriages & Wagons for today's writer, I discovered the carriage that was considered the RV of the 19th century. It was called 'The Brett." What made this wagon so effective was it had a long body and the seats were generally cushions or blankets. Some folks would set them on top of their luggage to sit up during travel, others would simply sit down with the cushion under the bottoms and across their backs. The driver would sit in front of the body and passengers could sit facing one another. At night they could spread out and sleep lengthwise because of the long body of the carriage.
Here are some pictures of a Brett.