I installed Erickson wheel chuck and strap kits to my sterling trailer this week for my z800 trail.   The galvanized bed is thin, so added some right angled bar under the beams to strengthen the chucks

That's a great idea. I just bought the Stirling 5 x 10 which I imagine is the size you have. How is this working for you?

Going really well.  Makes loading and unloading the trailer really easy, and strapping the wheels down is definitely the best way to go.