40 series are wider then stock and therefore heavier. So something to keep in mind is you may need to change your gearing to run the 40s, but then the engine is big so you may be ok. This was something one would have to do on the TNX 3.0. If you ran 40s, you had to change the spur and/or pinion (cluchbell).
Proline Big Joes are really sweet for general off road. Here is JAnderson's TNX 3.0 with Big Joes:
