99.9% of US trucks do not have a kitchen either, unless you count a microwave as a 'kitchen'. Truck drivers also stop at truck stops in the US for food, fuel, a shower, sleep, however many long haul trucks are now team operations - one guy drives and the other one sleeps.

There is something like a 70-90% parts commonality between a sleeper cabover and a conventional tractor, indeed - the only parts that differ are body, frame, and a couple interior pieces - even drivetrains are shared - and commonly shared between europe and NA - though European engines do not have the best reputation among US drivers (neither the Volvo or Mercedes Class 8 engine is well thought of - parts are expensive and take a long time, and sadly they're needed with alarming frequency). Indeed, many interior parts can be shared between a cabover and conventional truck, including the dash, and most of the interior appointments.