I agree the strongest 4wd is the tamiya 501x.
I was in a race with it and we all piled up in a big crash, I was the only
one to walk away from it basically unscathed not even a scratch.
Everyone else broke an a-arm. Easpecially that Lazer SP that rammed me.
I guess they were trying to see who was gonna break first.
Me and a couple B44's got to finish. Dont underestimate the B44 either,
I have managed to not break anything on mine in the longest time.