Big secrets might be hard to keep for us, regular mortals, but if we've learned anything from the world's biggest and most expensive megayachts, luxury RVs, and top-of-the-line motorhomes, it's that ...

Introduced in 2004, the 318RL offers sleeping for as many as 8 people, a "hidden" bunkroom, plenty of lounge space, a home office, and a full kitchen ...