Yes. I use McGard lug nut locks on my Skater trailer.

Kryptonite chains thru all the wheels, massive coupler lock (forget the brand- I've posted a pic on here before.)

If they want it, they'll get it. I'd like to find an alarm that has a siren, GPS locator and phone dial capability. The yacht guys have them but they cost as much as a nice used Cig.

Two questions

Do you dunk it in salt water and is there any problem with that?

Did you race your Magnum w/ Chuck B in NJ?

This may sound silly, but don't forget to lock your spare on your trailer. I had someone steal my spare off of my trailer and I didn't realize it until I blew a tire and needed it...

It also helps when the spare carrier breaks and the wheel drops on the freeway!!! had that happen to me while in the passing lane.....dude on the right comes screaming up on my side honking and pointing to the trailer/boat....i look in the side mirror to see a trail of smoke from the tire rubbing the ground....had a nice hole in the sidewall but the rim was still good! Could have been worse :)