I am pondering the idea of purchasing a jotto desk. My question has to do with passengers. I know there are two models to choose from (one that bolts down and has one "post" to hold the desk; and the other that attaches to the seat rails and had two "posts"). Right now I'm leaning toward the seat rail model, but will this leave much room for a passenger's legs? What are your experiences with this model, as well as the other one when having a passenger ride along? Maybe someone could post acutal pictures of their models installed to give some ideas.