.... some more info... I am not sure that you even need a sliding 5th. wheel..... I hooked up for the first time and put the 5th. wheel in the center (over the rear axle) and turned around in the lot to check out the clearance.... I found that with the extension on the camper, that places the king pin toward the front of the unit... you may not need a sliding 5th. wheel... if you do get a sliding 5th. wheel make sure that the pins and safety pins are in place and solid.... just thought I would add this ......... take care and good luck...