Shimming rims to clear toe rods

Well I found a deal on some used kenda executioner tires and renegade rims so I went and picked them up yesterday. What me and the seller didnt realize is they were 26x10x12 on the fronts. Of course you all know what happened when I went to put them on. Just wonder how far you guys have gone shimming the rims out using washers. I put 4 on each stud and it will clear then. That only leaves about 1/4" of thread though. Washers stacked were about 5/16".