I use a 4 way with my 53 yr old 230lb rear end behind it. I use it before I hit the road and spot check them at every stop. After having the wheels off for anything I check them at 10/25/50 and spot check at every whiz stop, which is more often the older I get. I have never lost a wheel and I have towed a few trailers a few miles. Take your trailer for a safety inspection, brakes, or new tires, and I'll bet you a torque wrench (Snap on or Cornwell, not a HF Pittsburgh pro) that the guy grabbed his trusty impact gun and left them (your nuts) have it. Ask him specifically if they used a torque wrench they'll say "sure did"......they didn't.
It amuses me when people run out and buy a torque wrench at Harbor Freight or Northern China Tool. If that makes you feel better and safer go ahead. Its your money. There is no telling how many lbs/ft theyre getting them to but they feel better. I prefer to spend my money on beer.
Take a heat gun and peel the advertisement off the side of the trailer.