Stretch Limousine

Some funeral homes maintain six-door stages to carry the family of the deceased between the church and the cemetery. These are usually not used for private hire.
Exotic limousines
Sometimes a coach builder or car designer will develop the "ultimate" stretch limo, adding amenities that are somewhat impractical but which make a significant design statement. One such design includes tandem rear axles to support the weight of an operational hot tub.