IMO, all manufacturers build a safety factor into their ratings.
Nobody knows what that safety margin is, and they more often than not won't tell anybody.
Yes, the receiver will handle more than it is rated to handle. The "Breaking Strength" is not advertised, as it is on rope, cable, and chain.
If it were me, I would go ahead and use the front hitch to slowly move the trailer. If the hitch broke, I wouldn't even bother to tell the manufacturer. Exceeding the ratings voids any warranty, it would make no sense to bother Customer Service with it!
