Hey Don,
I think that you can a whole lot more than that on there. At the 104 count that is less than 7 legs per tray. I get about thirty thighs on a tray. I feel you can get at lest 14 or more. How large are the quarters??
And then you throw in the lefts and rights and they just mesh together very well. I had a Kingfisher and it had only 4 trays 10"x42", and I had 60 on it. And I have found the extra 2" in width of the trays really makes a difference when it comes to loading it up.