I have the OR-Fab tire/can carrier, I like it .... It has a bar with a hole that fits thru the plate the holds the wheel onto the carrier (under the "T" handle) ....You can put a padlock thru the hole to secure the wheel. Only problem is the bar is held on by two bolts , thieves can remove the bolts if they want the wheel bad enough...
I pad locked mine, the "T" handle is a 1" All thread, seems to work well..... "BH"