I also have 285/75/16's on the factory alloy wheels and they look good and give me no rubbing they are the equivalant of a 33 inch tire I think you will be very pleased with this size but this is my opinion!!

 

^^^No, the factory 285s are the equivalent to a 31" tire.

 

yeah, its a good truck, i just need to weld in some new floorboard before i hit the ground on the next speedbump, you can see the ground through the holes! lol, but the frame is solid, heres another pic of the rear, i just love how it blows black smoke out those stacks,
<a href="http://s241.photobucket.com/albums/ff139/878561/?action=view&current=16254_181122555828_655145828_ 340090.jpg" target="_blank"><img src="http://i241.photobucket.com/albums/ff139/878561/16254_181122555828_655145828_340090.jpg" border="0" alt="Photobucket"></a>

and heres my vdub, i used to like it, but i cant stand it anymore, if any of you have ever gotten stuck on a speed bump you know what im talking about

<a href="http://s241.photobucket.com/albums/ff139/878561/?action=view&current=Photo-0088.jpg" target="_blank"><img src="http://i241.photobucket.com/albums/ff139/878561/Photo-0088.jpg" border="0" alt="Photobucket"></a>

 

I say go with 32 11.50 15 on a stock 4x4. I wouldn't go bigger than that.