I know this is an old thread, but I thought I'd add (or summarize) my experience with the Matco wheels and brakes on the -10.
There are three issues which you need to address to complete the installation:
1) You have to slot the cotter pin holes in the wheel nuts so you can drill the cotter holes farther inboard on the threaded gear axles.
2) You must have inner tubes with right angle (90') valve stems. The straight stems interfere with the wheel nut cotter pins.
3) There is a fitting on the Matco calipers that interferes with the wheel pant brackets. Matco's suggestion is to form a bulge in the 1/8" aluminum plate brackets. That isn't within my capabilities, so I will cut away the offending area and rivet on a stiffener.
2001 RV-6 N46KB