Class A RV's come in two basic flavors, Gas or Diesel. They start at about 21 feet and can be as long as 45 feet many with multiple slide-outs. With all of this space inside, they're usually equipped with a rear master suite, large kitchen and a comfortable living area. Large flat screen HDTV's, surround sound systems and residential style refrigerators are common. The list of upgrades and options is almost endless. Basement storage can swallow enough supplies to keep you on the road permanently. These are great traveling machines that let you drive comfortably all day and sleep comfortably all night.