A man in a large red truck.
Nobody is a truck
Either someone is or isn't occupying a space, but it can't be both.
exists s1 s2 x1 x2.(a_topic(x1) & in(x1,x2) & n_truck(x2) & a_red(s2) & Theme(s2,x2) & a_large(s1) & Theme(s1,x2) & n_man(x1))
-exists p1 x1.(exists x2.((x1 = x2) & n_truck(x2)) & n_person(x1))