The difference between the Correct Track Trailer Alignment and Lift Kit # LC87120 and the Correct Track Trailer Alignment and Lift Kit # RR23QX is that the # LC87120 is for a single axle trailer and the # RR23QX is for a tandem axle trailer.
Since your 2018 Jayco Eagle is a tandem axle trailer you would want to use the # RR23QX tandem axle kit. The # RR23QX will contain all the additional parts needed for a tandem axle application. view full answer...