Spare Tire Rack question

[Dagrip]

We have a 2007 2720SL. Due to some other posts that I read this week I decided that I needed to verify that all is well with my spare tire. It came off easily but I am not sure that I have put it back on correctly.

I have slid the rails in, dropped the two pins through the holes, and then put the cotter pins through the pins. As a result the only thing that is holding ALL of the weight of the tire and the rack are the two light-weight cotter pins.

Is the rack supposed to lock in more securely or are we just supposed to rely on the cotter pins?

Thanks!

Scott