Traditionally, the limousine has been an extension of a large sedan. A longer frame and wheelbase allow the rear passenger compartment to contain the usual forward facing passenger seat but with a substantial amount of footroom — more than is actually needed. Usually then two "jump seats" are mounted, facing rearward behind the driver. These seats fold up when not in use. In this way, up to five persons can be carried in the aft compartment in comfort, and up to two additional persons carried in the driver's compartment, for a total capacity of seven passengers in addition to the driver. This type of seat configuration has however become less popular in recent limousines.

It is simpler and more straightforward to determine the effects of altering a separate chassis than it is to determine the effects of altering a load-bearing unit body. For this reason, the automobile of choice for conversion into stretch limousines is currently the Lincoln Town Car, whose Panther platform is one of the last remaining automotive platforms using a separate load-bearing chassis.[citation needed] However, coachbuilders have recently built many new models based on SUVs with separate load-bearing chassis, including Hummer H2s and H3s.

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