This unit has been on one trailer for about 6 months and one camping trip.
The Jack-It innovative frame design installs over the tongue jack on the trailer's A-frame, the softest riding area on the frame. The adjustable wheel cradles and SwayStop straps secure the bike wheels to the bike carrier for a secure ride. The PowerTower frame protects tongue jack from impact. Jack-It holds two bikes by the wheels for balance, stability, and ease of use.
• Fits all bike frames
• 25-lb. total weight
• 80-lb. load rating
• Clearance Above Trailer Frame: 22.5"
• Fits most A-frame travel and cargo trailers
• Carries bikes by the wheels for balance and stability
Here's a link to Camping World's web listing:
https://www.campingworld.com/jack-it-double-bike-carrier-system-95634.html