Oversized load distribution hitch?

The Nissan Frontier is Nissan's answer to the Tacoma. It is a mid-sized truck with a V6 motor. I believe ours has a 6500lb towing capacity and our 179 was about 3200lbs dry.

Thanks to all! 

I do not believe a 191 weights anywhere near 4000 pounds. What is your weight distribution hitch recommended for? You should have a max of 6000 / 600 model. 

then there is the subject of tires.  When I went to load range E tires all of the little tiny side-to-side movement that you see in the rear view mirrors went away

Your Chev pickup is stout enough to handle your rpod both towing and tongue weight without any additional equipment.  It is simply a matter of what you prefer like GlueGuy has indicated. I have a 22 Blazer with a 3.6l engine and I have a safeway e2 equalizing hitch with 600 load rated bars on it. The bars of the hitch work as the sway control for this setup. This setup works well for me and I feel confidant in it.  So the minimum that I feel that you need would be a sway control bar but using a 600 load rated e2 equalizing hitch would not be out of the question or do any damage if set up properly. The sway control either from a equalizing hitch or sway control bar helps to mitigate the wind/vacuum effect of a 18 wheeler passing you on the expressway which tends to make your rig wonder while driving at 60 mph down the expressway. Just get something that gives you peace of mind. Happy camping.