Nary a day goes by when we don’t wonder what the world’s fastest mobile hot tub is. You can often find us lost in thought over the feasibility of a daily driver we can also take a dip in. We know we aren’t the only ones. Finally, finally, we have an answer, and that answer just so happens to be up for auction at Barrett-Jackson. This 1969 Cadillac De Ville Custom Convertible is the Guinness World Record holder for “World’s Fastest Mobile Hot Tub,” and you can soon park this four-wheel spa in your driveway. Packed with a 370-gallon custom fiberglass hot tub, the ocean blue ride is powered by a 427ci 8-cylinder engine and a 3-speed automatic transmission. The water can reach 110-degrees and you can flip on a spa pump, adjust spa lighting, and control audio and video from a touchscreen display. You’ll just need to wear bathing suits a bit more often.