Craig,
For some reason your question caught my attention the way that you worded it (maybe because we are both Mechanical Engineers [even though I'm not currently employed as a engineer]). Before my first post I was guessing that you were an engineer of some type; some time after my reply I checked out your profile and confirmed my suspicions.
In any case, I don't have the "wheel weight" numbers that you are looking for. However, since your purpose of needing the numbers deals with a FEL design, I have some numbers that may be beneficial to you. I have a B2150HSD with LA350A loader, and my Kubota loader manual lists the loader weight as 720lbs and the 50.2" wide bucket weight as 176 lbs.
Hope that helps,
Kelvin