You got your maths wrong. 1 ton is equal to 2000lbs. No matter what else, Heavy Horse specific breeds CAN jump and by golly they can gallop but I still would not risk jumping mine competitively. My two boys (Clydedales) are far too precious and I don't want any problems with their joints later on in life. I am hoping my two boys live for a very long time and remain in good health - fingers crossed that I will own 2 X 35 year old Clydedales. Draft horses are different. These horses in the UK are called Heavy Cobs (they can get up to 17.2hh give or take a few inches) and are used for hunting, jumping and are good all round horses. I used to jump a wonderful cob (draft) who stood 17.3 hh but his bone structure and muscle structure was totally different to my two GENUINE pure bred Clydes. However, breed specific horses such as Clydesdales and Shires are bigger and heavier than your generic draft horse. They carry their weight and muscle differently to your generic draft which although may have SHire/Clydesdale/Belgian/Percheron blood in him, will have been outcrossed to have a large horse but with a lighter frame. If you want to know more about genuine heavies, read up on specific breeds or contact The Shire Horse Society or the one I belong to, The Clydesdale Horse Society (Patron, HRH The Duke of Edinborough) who is as passionate about 'rare breed' true heavies as me. Good luck with jumping your draft horse though.