The 40-foot long Elemment Palazzo is the most expensive RV ever. This futuristic vehicle is a palace on wheels. nothing compares to its luxury. It has got master bedroom with adjoining bathroom, rainfall shower, fireplace, a pop-out bar, a skylight and under floor heating. All that glamour won’t slow this vehicle down. With its 20 tons The Palazzo can reach 93mph. It is completely customizable and it uses 20% less fuel compared to other vehicles of that size.