Myself and a couple friends have combined, at least 10 1/10th scale rock crawlers. It's a blast. It really gets technical trying to figure the right line to take and who can do better than who on a certian line.
Here's one of mine with the small rubber on it. It now wears the spec 1/10 scale wheels/tires.
To all the people over there, hope you come home soon. 8)