Ok I made a mistake I was thinking that Tahoe and suburban changed in 06 as well but it was in 07 that the newer one came out.
And if you want the lowest price look at the gmc Yukon too same car different badge.
You shouldn't need any modifications for the off road use you need.
For aero mods a good start would be, wheel covers, grille block, rear wheels skirts, and a roof rack delete. Smoothing out the underbelly would be another good mod, and if you feel comfortable with it a passenger side mirror delete. Weight reduction is another option you would have too.
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