I have to use two lube plates; 1/4" thick combined with another 1/8" thick. With just a 1/4" plate my upper kingpin ridge rides on my hitch jaws and did not compress the lube plate making it worthless. I would think kingpins would be of standard specification but apparently not. It took some trial and error to get the jaws centered in the kingpin groove. Just something else to think about, if I recall the Companion has some thick jaws.