Wow that's a big jump! I don't ride drafts exclusively but I only own drafts and prefer to ride drafts. I've been riding since I was 3 so of course it wasn't always an option to ride the larger breeds, in fact I only started on drafts when I was 16 when I started training them for saddle work with a friend of mine. Since I was 10 however I didn't ride anything smaller than 16.2. I prefer the larger horses.
Where are ya? You ride drafts exclusively? Years ago a friend of mine had an 18 hand percheron, pure white, and he was a jumper par excellance. I saw a photo of him jumping a toyota pickup (the smaller type), right over the bed! With ride aboard.
He had trouble backing up , though.
The owner used to take him to Arizona and do "fox" (read "coyote") hunting , tearing over the sage brush. I only rode a couple of times on the trails when I wanted a very calm ride. His gaits were bone jarring, though. Sweet horse.