Good day,
I was looking at those spacers that Rocky Road Outfitters has which are
1.25" thick per wheel.
I figured if that they were of appreciable gain, I would spin some up on the lathe in that size and if they were too thick, I could mill some off an 1/8" at a time.
As far as more stress on the wheel bearings... Yea, I am aware of that as well, I run 1.5" competition spacers on my Mini. However, I am still on the same set of bearings(ball not timken)for the last five years, and they are still in excellent condition.
Besides, if you run different wheels with a different offset, this will also move the wheel out and place additional stress on the hub assembly/bearings