Have you considered Pitbull Rocker Radial in 37x12.5x17? I've heard really good things and the 17" rim and radial makes them not look like balloons like most of the bias ply versions.. They are supposed to be an AWESOME tire..
Here's a few pictures stolen from
muddywaters on another thread:
![](http://i242.photobucket.com/albums/ff284/kelvonlove/IMAG0326.jpg)
![](http://i242.photobucket.com/albums/ff284/kelvonlove/IMAG0327.jpg)
![](http://i242.photobucket.com/albums/ff284/kelvonlove/utf-8BSU1BRzAzNDEuanBn.jpg)
![](http://i242.photobucket.com/albums/ff284/kelvonlove/utf-8BSU1BRzAzNDYuanBn.jpg)