As is the case with only a select few extra-large motorhomes, CMC Caravan has two regular-sized bathrooms, including one spa-like haven that houses a bathtub, which is an incredibly rare sight in an RV.

While CMC Caravan's 61-foot (18.5m) models may seem gargantuan, the biggest RV in history measured an even bigger 65 feet (20m). Built in the 1950s by the Mid-States Corporation, the articulated Executive Flagship mega-cruiser rocked a sun deck, storage for an inflatable swimming pool, and other extraordinary amenities.

Read on to discover the best place to stay in a RV in every US state...

Monster motorhomes: inside the biggest RVs on the planet