Magnús Laurasson is well over 6 foot, he is an Icelandic horse trainer, there are few Icelandics over 14hh (In spite of what some folk will tell you!!) I guess Magnús must be about 17 stone, or there abouts. I caught him riding my 13,2hh Icelandic and that horse danced, I had never seen him move so well under this guy. And I was worried that my 13 stone was too much for the horse.
A 17 stone, well balanced rider, who is fit and can carry his own weight is better for a horse than a 10 stone unbalanced unfit person.
Fákur is our weight carrier, he's 14hh maybe and doesn't blink at 18 stone.