From the manual:
1. Purchaser is advised that the load created by rack and bicycles may exceed the strength of trailer or 5th wheel bumper or other mounting
location. Failure through improper mounting will void rack warranty.
2. The recommended 14” ground clearance is not sufficient on trailers or 5th wheels. Ground clearance must exceed 15” and will vary upon
application. Damage to bicycles or rack due to ground clearance problems on trailers or 5th wheels is not covered by warranty.
3. Excessive movement can cause damage to the rack or bike. This is not covered by warranty. Pull the rack back and forth and if the rack has
excessive movement a separate tether strap should be purchased.
Truck roof rack = win.