I use kadees on my engines also. I don't have any direct experience with 042 or 54, but I don't think kadees and 042 will work, nor on 054 unless maybe you truck mount them. Even then it may not be possible.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .