The Trimax King Pin Lock # TMX56RR can still be used with your 5th wheel having a capture plate from PullRite. The capture plate mounts to the top of the kingpin and only takes up a similar amount of space that a Lube Plate # RP83002 would. If you happen to have one of the few capture plates which also has a funnel type block welded near the king pin you would want to consider a lock like the etrailer # e98896 as it does not have the section which slides over the top of the king pin channel. view full answer...