Re: newer to offroading
My first question before taking such a venture would be: will the tranny & rear-end turn such large tires. These tires could change the dynamics of your stock gear-ratio in the axles. Does this truck have the 4.3L Vortec? It would not be to your advantage if you could only go 45 mph on the e-way w/ the engine screaming at 4000-5000 RPM's. I could be wrong, but certainly a question to ask a pro if you didn't know any better.
The guys that have track cars put in big tires for a variety of reasons, as well as putting in a bigger ratio to spin those tires. But they are sacrificing high-end speed (RPM's at 2500 @ 65 mph). I would wonder if this would happen to you. Hope this helps.