I would pay very well-combined weight would be about 2000 kg
4 large horses and you reckon only 2000kgs?
Are you putting them on a diet or something before they travel?
Oh and by the way there are very strict guidleines for moving animals and livestock. You dont just walk them up the steps on to the aircraft.
I would strongly suggest you do some research 1st, unless you are on a wind up.
I don't care where it is going as long as it is OUT of ASIA !!
Asia is a big place as am I sure you know. So what has an entire continent done to upset ya?