Re: 8 Frame Hives for Pollination vs 10 frame
You can fit and extra row of boxes on the truck by using 8 frame boxes instead of 10's. You'll have 4 less frames per two story hive, so swarming might happen a little sooner in 8's vs 10's. I assisted a side liner for almond pollination in CA for a couple of years, he used all 8 frame deep 2 story hives. He gave the reason as being able to fit an extra row of hives on the truck.
I've been keeping a few hives for the past 20-25 years, and no longer treatment free as I got tired of the losses.