What type of rear air deflector? One for towing a trailer to deflect air up to get better gas mileage, or one to deflect air down over the rear window?
I've seen them around town here and there. I'll pay more attention the next time that I see one to check out if there is one with the lift-back door or the barn-doors.
A big brick? Unless your going to break the 200 mile an hour mark in your Tahoe I seriously doubt theres any reason to add anything for downforce. If it's a handling thing you might want to look at upgrading your sway bars and maybe doing a 2.5 drop(easy to do) and some nitro shocks.
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