In regards to the Trailair Flex Air 5th Wheel Pin Box part # LC328492 and MORryde Cushioned 5th Wheel Pin Box part # MR84VR, the weight difference is about 40 lbs. The Trailair is about 230 lbs and the MORryde is about 190 lbs. view full answer...
The correct 54" Yakima Tracks for a Camper Shell is part # Y26RR which will allow you to use any standard track mounted roof rack. The other options you listed, part # Y01127 and part # Y64MR are for metal roofs and ladder racks respectively. Since you have a fiberglass camper shell you don't need the version that comes with hardware for metal roofs and since you'll be installing the tracks on the roof of a camper shell you likely won't be using a ladder rack system which mounts to the tracks. view full answer...