B&W recommendation on page #5;
B&W pull test PULL TEST
***Have the truck stationary with the emergency brake
on, the trailer wheels blocked and landing gear still
resting firm on the ground supporting the weight of
the trailer. Make sure no one is between the truck
and trailer, return to the cab of the truck. Release the
emergency brake and apply the trailer brakes. Try to
pull the trailer forward with the truck. If the trailer is
properly hooked up, the wheel blocks and trailer
brakes should not allow the truck to move forward. If
trailer is not hitched correctly, the trailer will separate
from the truck. However, with the landing gear
resting firmly on the ground, it will support the trailer
and not allow it to drop or fall on the truck sides.***
B&W like all lite duty rv or heavy duty OTR 5th wheel hitch makers offer this bit of advise. Being in the industry they all know and understand the reasons for a tug test which has less to do with a liability statement but rather a fact of life with any brand, or jaw type, 5th wheel hitch.
If your a bla bla bla brand hitch owner and don't want to do a tug test then thats fine. Thats doesn't mean a tug test isn't needed for that brand hitch.