You need to get one that locks on that Yakima hitch pin that came with the rack. When you buy the Yakima Deadlock, IIRC it comes with a lock for that pin. If you get just a normal pin with a lock, that rack will bounce everywhere, because it doesnt screw in like the Yakima pin does.
Yes as mentioned, if you pay more for the yakima one, it will thread into the rack & stop it from wobbling.
On that note, I use a standard locking pin from the local truck acc shop. I try to find a decent quality one that is made of stainless, otherwise they rust so quickly if you leave it on all the time (like I do).
My rack wobbles a bit but it doesn't hurt anything.
Thanks again. I am going to a trailer whole seller this weekend and will see if he can find one that fits. I will follow up later this month if I am successful.
There does not exist a lock that will prevent your rack from being stolen (or bike or whatever you want to lock). Locks are a deterrent of theft, not a preventer sadly. I personally can't stand to see my rack swaying behind me so I like to stick with the bolt-style hitch pins.
Don't you hate it when a sentence doesn't end the way you think it octopus?