All terrain tires for 2007 Tacoma

Hey, I am wanting to put some on/off road tires on my truck. I am new to 4x4 trucks so I dont know what size to get. I don't really want to lift my truck. Does anyone know what the biggest tire is that I can put on a 20" rim on my 07 Tacoma 4x4 without any rubbing problems. Also, what kind of tire do you recommend. I have heard that some types make alot of noise while going down the road. I mostly drive on the pavement but like the look of the off road tires. Any help is appreciated.

 

20'' off road tires usaully start at 33's and up i'm not sure if 2nd gen's can clear them so u might have to get a lift or buy smaller rims

 

Thanks, I don't really want smaller wheels unless I have to.

 

I was talking to the owner of a wheel & tire place. I am looking at some 20" procomp wheels and all-terrain tires. He said they should fit, but I am not positive. I'll let you know if I find out more info.