I think L.C. is planning to surprise me with this for Christmas. I don't think she could have meant anything else when she sent me these photos, do you?
Mercedez-Benz introduced the Mayback in 1997, as an ultra-luxury concept car. It was actually marketed in the 2000's, under the sole name Maybach.
It is available in 57 and 62 (decimetres). The latter allows the back seat passengers to fully recline their seats, which are heated, cooled and massage.
The most powerful has a 6.0 L V-12 engine which delivers 604 HP.
Priced from $335,500 to $426,000. At least those were the prices when the Wikipedia article was published. With the exchange rate now, it's probably higher.
You can customize this car up the wazoo, with over 2 million equipment details alone. Maybe add on a home-made camper.