When I ordered my truck I had the 5th wheel prep installed. This puts a plug on the driver side rear fender wheel. I use this one. My camper has the plug and the cable is not attached to the camper so after I load I just reach into the rear wheel well and plug in the cord and then plug it into the camper at the front. My cord never has a chance to get under the camper as it fully loaded before the cord gets plugged in. I like keeping my rear plug open for the trailer and personally I don't want to use a Y plug as this is just something more hanging off the back of the truck.