I think we need to know what truck you want to use them on...
Then I'll probably think they are to wide.

Look here, page 39
http://www.accuridewheels.com/completeversion.pdf

Smallest recommended tire on a 20 x 8" rim is a 10.00-20 tire, and they are usually about 40" tall, and obviously reasonably wide too.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-