Thanks. There is nothing under the seat. It's mainly the upright position she complained about. I was surprised because she can ride in the back of our 86 westy for hours without saying a thing. Need to find a solution to this cause I plan to use JT for road trips this summer.
My daughter complained about how her back hurts after riding in the rear seat today :facepalm:. I wonder whether there are any rear seat recline solution for JT similar to the one for JL.