Believe it or not, I had the same issue with my new KK that I bought last year when we got the MH. I tried to pull out the pin and ended up pulling the ring off the top of the pin. I then raised and propped the tongue up as high as I could and tried beating it out with a hammer and punch. After I finally got the thing out, I sprayed it down with wd-40 and the pin moved in and out like it was supposed to. In fact it felt as if the pin was too small for the hole...
Since you have nothing else to loose, spray the pin down as best as you can with some sort of penetrating oil, silicone spray, wd-40, etc., let it sit for a while, then try to pull it out, or hammer it out from the bottom.
Let us know how you make out.
Duane, Claudine and Ashleigh Miller
2009 Winnebago Sightseer 37L, Ford F-53 Chassis