Yes I could see the advantage of being able to have a horsebox body and a basic cargo box for work then you could swap over, otherwise a normal conversion would seem to be cheaper and more practical and my guess would be the payload would be the unit, the box and its load would be the payload of two tonnes so most likley about 1200kg actual capacity but a clever idea all the same....Wow! That could solve all my OH's building problems and my horsey problems! 2t payload would be brilliant as well!