We purchased the Keystone Passport 2520RL and we have our first couple of trips booked. Our first weekend is in nearby Gettysburg and I booked a pull-through site so I can get used to pulling this a little bit before I need to back in to a site. For Labor Day we will be off to West Virginia. The site I booked is listed as "Drive In". What exactly does that mean? Do I pull straight in and then back up to leave? Sorry for the obvious rookie question!