Static tip angle means little in the real world except for comparison purposes, in my view. Too many dynamic variables.I would like to see a chart of the max tip angle of the tractor vs 1", 2", & 3" spacers.
Also, they seem high priced. I think someone with a lathe could fabricate them for cheaper.
Bottom line is that adding wheel spacers can only increase side slope stability.
There is a valid argument that spacers add stress to tractor components. But rarely, if ever, do we hear of issues related to the installation of wheel spacers.
As TheOldHokie said, sometimes it just makes sense to buy something you could make yourself. Yes, they certainly are not cheap, but options are limited for larger tractors.
Now for a BX, I got a set of 2 inch wheel spacers for under $60 delivered, that were well made. Imported of course, but they work perfectly. No luck finding something similar for my B2910 though...