I'm reading this really good Universal Studios history book(seriously it's really good). Shameless praise aside, there is a paragraph referencing the canned Jurassic Park jeep ride. ''Originally Universal intended to build an attraction based around the jeep ride that would be featured heavily in the movie. However Goddard(one of the men behind islands of adventure) felt this would work. In his words, I noted that our T-Rex was not going to be able to chase the jeep or tear thorough trees or jungles''.