Nylon lock nuts came from the aircraft industry to solve the problem of nuts
loosening due to prop engine vibrations. Always used them when I made model
airplanes. Painting the threads after the nut is tight with finger nail
polish is a good idea as a backup as well or use a product such as locktite.

"mm" wrote in message
...
I bought one of those little kit trailers, what you can get for about
350 dollars, with a 4x8' bed, for a one time use, and some little uses
aftewrads. From Harbor Freight that carries 990 pounds they say. I
only need to carry less than 100.

Assembling it today, I noticed that they depend on nuts with nylon
inserts to keep the nuts from coming all the way off. They depend on
tightening them tighlly to keep them from coming loose.

Is that enough or should I put split ring lock washers under each nut.

Or would it be better, just as good, to put jamb nuts on the bolts
that are long enough.

IIRC the instructions say in one place to check that the nuts are
tight after 100 miles, which seems like a good idea, but in another
place I think it said every 100 miles!!!!!

Thanks