Marathon Coach is to motor homes what Bentley is to automobiles: pure luxury. A brand-new, fully loaded model can go for as much as $2.2 million, though used models can be picked up for less than $200,000. A custom order takes about 180 days to build. For starters, each Marathon Coach has a minimum of five high-definition TVs, ranging from 7 to 50 inches in size. A 515-horsepower engine powers this house on wheels, and the stainless-steel chassis is covered under a 1.5 million-mile warranty. Other wild options include pullout barbecues, electric fireplaces, a second bathroom and a wine chiller. The major drawback is that the vehicle gets only about seven miles to eight mpg.