When Dancer is at her full weight, she weighs about 1200 pounds. The 20% figure means she could only carry a total of 240 pounds - rider + tack. With me at nearly 300 pounds, with a generous allowance for tack, I would need an 1800 pound horse.
If you are saying that Dancer could only carry a total of 240 pounds, I need to put a complete halt to any plans of riding her.
Plain Old Dee, horses Dancer and Rain I believe in dragons, unicorns, good men and other mythical creatures!