My understanding is this should not be a problem, due to the fact that they dont run motors as low wind as on-road mod touring. Although it might be safer to go with the Pro, i think that reps have posted here that you only really need the pro for mod touring car.
The standard is "Motor Limit Brushless Mode: 5 Turn, 36mm can"
I dont run off road but im assuming you would just be getting massive wheel spin and dig holes in the track with a 4.5 or faster mounted.