"Unloading dock" for hay grapple

Hey everyone, I run a Kuhns accumulator/grapple set up. When stacking 4 or 5 high I have a hard time unloading the top couple grabs off the trailer, resulting in dropping bales, ect.
So I was thinking of getting 4 of those concrete blocks, (2x2x6) and running them butted up to each other and than making a gravel ramp. I would then tow the trailers along this and unload.
Any thoughts or better ideas?

"Unloading dock" for hay grapple