We have a 2019 3121 RL as well and we have nothing like that, just a strap that goes around the legs of the chairs. We bought ours last August, so it must be an improvement during the model year. But as WeBeFulltime said above,, I forgot to strap them ionce and they never moved an inch over a 4 hour trip. Enjoy your new 3121RL, Congratulations!
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