Rockewlls would make for a very tall truck and just as low gears although I think aftermarket faster gears are now available. Still leaves you figuring out brakes? Mounting the front axle to the springs might be difficult and taller springs are probably required.

Certainly you should look into it, but in my opinion I bet you find it's not a great idea.

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-