I have a 1991 Jayco designer fifth wheel camper with the 7900 pin box. I’m towing it with short need F250 currently and need more distance from the cab. I’ve read about the slider hitches but you slide it back toward the cab when traveling and I don’t want that. I’ve read the 7910 pin box would give 10 inches of additional space as would the RV5 extension from Pop Up Industries. I’ve read older forums discussing this topic but none say what their solution was. I’m awaiting a response from Lippert Chassis. Thank you in advance for any information anyone has.