I'm looking to buy a smittybuilt rear bumper but I notice they come with a receiver hitch I'm wondering how that will affect my tow package that's already on my jeep since I opted for the Max tow package group

 

Your tow package is the hitch, trailer wiring harness, shock springs, and possibly the gear ratio...from the best of my knowledge the factory hitch is attached to the bumper...its just a simple as removing the old bumper and installing the new one and plug your receiver in