The layout of the KIA enRoute shows ... its limited for 3 persons (a hugecomfortable driver seat for the salesman + 2 optional seats for woman or/and child). In my future scenario a salesman gets a business car just for his job processings. If there is a emergency or if he keeps the car over the weekend he can carry 2 more people. Usually there is the luggage compartment behind the driver seat. If the driver has to carry someone else he can fold down the two seats in the back.
Length > Audi A5 width, front > BMW 5 series E60. The height is changeable by ride-height control.
There is a possibility to put a high efficient piston (directly driven crankshaft) engine between the rear track and if electric technologies are perfected you can replace the piston engine by some batteries.