10:00x20 tires require 7.5x20 rim. You don't state the year of your truck but a 1-1/2 ton would likely be 8:25x20 with 6.5x20 rim or even a 7:50x20 on a 6". 9:00 tires require a 7" rim. If the rims you have will fit the tires you want then I can't imagine that the tires would rub the springs as you would expect to see on a pickup or car. There is a lot more clearance on a cab & chassis. But whatever 10:00 is too big for any 1-1/2 ton truck. Your GVW will determine what you need or what came standard on it. What year is it?


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Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain