I just learned this from my doc at Mayo. Apparently all of us with this disease are at high risk for blood clots. To help during the 8+ hour drive he said to stop every 2 hours or so and walk for a minute. Apparently that's all it takes. He also said like on an airplane or even in the car to keep moving your feet.
I don't have blood clots but figured I should share this info to help us keep from having them.