Sorry
Here is my world view. The thing that makes the most significant impact on appearance of the tire is the basic width versus the actual width of the body. You have much more leeway when it comes to height. This is why I think Tim's rig almost works (close to the 1/8 scale than the 1/10). The width of a pitbull vs a 1/10 scale rig would be close to 24" wide. This would correspond to a 55" tall tire. The info I have seen has the max width on the pitbulls at 19.5" (I could be wrong) with a height of 41" (not 55") so while yes, the proportions of the RC tire to the 1:1 are dead on, the proportions of the tire to the rig are off. They are too wide for the bodies that most people run. The narrower stance of the roclox works better with the body size but I will admit that the height it pretty extreme.
Also, the sidewall height makes a big difference on appearance. Don't see a ton of people running 22" wheels on their rock crawls (yes, I know, someone has a picture of one that they will post up to prove their point and to show that I am a complete noob and shouldn't even be involved in this conversation.)