There's at least 900kgs of car there never mind the trailer.
Overloading a vehicle can have severely adverse affects on stability and handling, especially at higher speeds and in an emergency situation.
I'm sure if driven sensibly it's perfectly fine but if something went wrong and you had an accident you would get raped by the authorities here. You'd also be pulled over and fined as soon as the first cop saw you or some dutiful fellow road user called them about you.
Cars on car trailers are generally towed with family sedans or big 4WDs that have a high enough towing capacity for the weight of the car + trailer they're towing here.
HTH
Nice rides BTW