Are you going to drive strictly off road, or use them for every day driving too?
If you were racing you would not have just one set because of the different types of conditions.
As for the rims diameter you obviously don’t want to go over the stock 16†so the vehicle can absorb the bumps.
As for the tire width, it gets tricky. I stayed with the 235 / 60 / 16’s even though the norm is to go down to the P215/70R16.
The 215’ will dig and hold better heavy (wet or packed) snow situation. Not skate as much.
The 235’ are great in virgin powder and even better the deeper powder.
As for slush, a good V-directional 235’s will disperse it as well as the 215’s, plus there is slightly more road contact.
Also, steel rims will add wheel weight, which is good.
Weighing down the Rav helps too.
As for tires you need to be specific on where you are going to be driving.
Hope I was of some help.
