Thats all he cares about. Who cares about the Pumpkins! He just wants to sit on all the tractors. I am not sure if he has a favorite or not, he just loves the tractors. Vii and Nathan went over one night and he wanted to try them all out. 
He was not happy when Vii wanted to take a picture with him becuase then it took him away from "driving" the tractors.