Well, I know some guys like to use the "spinnerbait trailerbait" which looks like this http://images.ebsco.com/lurenet/YBT483.jpg But I've also heard of single tail grubs being popular, and I have used them with success as well. The only thing is that alot of the times a spinnerbait without anything other then a trailer hook tends to work pretty good for me. Regardless, I was curious to know when do you choose to fish a spinnerbait with a trailer bait over a spinnerbait without a trailer bait?

I suppose a spinnerbait with a trailerbait will give the bait a larger profile, so I guess if your trying to imitate a larger bait a trailerbait is key?

I've never been a fan of a trailer on a spinnerbait.  In all honesty I think it does nothing to improve your catch rate because I feel that up until the moment of the fish biting, it's focus is on the blades.  Once it keys in on the skirted area, I don't want those tails sticking way past the hook.  

As far as using a curly tail grub, the only advantage it would give you is lifting your bait if you rig it tail down.  It's the same way a swim jig works.  

I use single tail, double tail, & twin tail trailers

The use of trailers adds lift when working spinner baits around vegetation

When I want a larger overall profile without adding weight trailers do the trick

It's probably 60% without 40% with

5" GYCB Single Tail Grub for me.

8-)

My trailer on a spinnerbait is a hook.  If I want more lift I use bigger blades.

I usually jam my used/torn plastic worms in the outer pocket of my tacklebag, so when I want a spinnerbait trailer I just grab a ripped worm and use a few inches of it as a SB trailer. It adds bulk, a bit more action, and you just can't beat the price.