Is there a trick to removing this connector? I've tried yanking on it from underneath the truck but it won't budge. It looks like there might be some sort of tab on the top but there's not much room to get up there with any kind of tool since the truck bed is just about an inch away.

 

I managed to get a small flat head drill bit into the top and used that to pry a little bit. I didn't think it had moved anything at all, but after doing that I was able to pull off the connector easily.