I like the design. I have a similar setup with a harbor freight trailer and ladder racks. I haul a TI on the trailer and a Oasis on the ladder rack. What are your steps for getting the top yak back on the trailer? I had a little challenge getting the Oasis back on the trailer at the boat ramp(i.e. read incline). Do you use a winch or pull it up by hand?
If I'm playing with the top boat there is always two of us so for getting the top kayak back on the trailer I leave the Amas out and locked, and with a person on each side it is easy to push it up the slope. I then fold the Amas in after the top deck is locked. One little thing I did which I think is a big help, is I put pieces of carpet tile in the cradles instead of the supplied rubber pads. This reduces the friction quite a bit.
I originally loaded the top boat myself from the beach dolly, and I rigged up a rope to pull it up, but in the end the rope got in the way, so I just left it off.