I had dinner the other night with a guy who used to do casting and such for Walker, Texas Ranger.
He said that Norris was actually quite short, and had to wear boots with huge pumps and a tall hat to reach 5'10". When the casting team was looking for actors, they could not cast anyone as a good guy for an episode if he was taller than 5'10". They had a piece of black tape on the wall. Bad guys could be taller, because that made Chuck look cooler.
His height is also one reason he spent a lot of time in that big ass pickup truck.
Toward the end of the show, he didn't even bother learning the lines. There would be a prompter lying in the back of the truck cab with the script, and they'd feed Chuck the lines one by one as needed.
