To quote the man that serviced my old ALKO based trailer.
"The nuts are made out of round, you need to put them on at about 250 ft lbs. Once used and removed they are no longer out of round, therefore IF you re-use them and torque them up to the recommended level you will harm the bearing"
Don't shoot the messenger but for the sake of £14...... Never mess with the bearings.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former --- Albert Einstein