I like to wrap a bass around it. Really keeps it stuck.

I stick a toothpick through the plastic and clip the ends flush with the plastic. If you stick it through tight against the inside bend if the hook, your trailer won't slip down at all.

Unless I want to bulk up a jig, which threading a plastic trailer up the hook shank and flaring the skirt out will do, I normally hook most trailers the same as a pork chunk. If loosing the trailer, or having it interfere with the hook up is a concern, I'll use a couple of the plastic circles I punch from margarine lids and use to secure my spinnerbait trailer hooks.  I've used HitchHikers, but this method limits the the side to side movement of the trailer for me.

I learned a trick from an old boy in Florida. He trims the fat lead of the keeper back, leaving just the skirt keeper. Then, he puts heat shrink tubing on the hook shank down to about the bend of the hook. That holds immensely well alone, but when you need a little extra, LocTite Gel super glue on that heat shrink will keep your trailer absolutely pinned.

The problem, though, that I have, I generally have to replace trailers far more frequently than I takes to wear one out from tearing or movin on the hook shank. I get claws and body tears so quickly that I rarely bother with the glue.