1. Is it durable? Yes, they're pretty durable depending on what you're going to do with them.
2. Can you make it brushless? Do you want brushless for speed or do you want brushless down-geared so you can crawl with it?
3. Yes. They will work.
4. Yes. They work fairly well on un-easy conditions.
5. Yes. I know of a guy who has a nice set of aluminum beadlock tires with Pro-Line Moabs. Beautiful, just beautiful!
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Now to get down to the real business:
The HPI Wheely King (4x4) makes a very potential crawler when you want it to come to that. But there are a few things standing in it's way when you want it to be a speed demon or a crawler. It has a VERY high COG and has a VERY high tendancy to flip in high speed turns and when crawling up a sheer-face. The problem with this is because of the way the chassis is set-up.
I have driven my friends HPI Wheely King (4x4 version) many times before and I liked the way it handled when going slow. For being 4x4 it could do just about anything I threw at it that was feesable for it to do. Even brushed (27T motor, very high T for stock) it could do a lot of things you wouldn't think it would be able to do.
Speed of a stock wheely king is not very fast, I'd say about the same speed as a stage two Xmod. And I'm being honest here.
I find the steering servo to be very slow, so you would want to upgrade that. But, it was very strong; so if you wanted to do crawling it would be an OK servo.
As you said before in a few posts you are a speed freak. This is not a speed freaks chassis by any means, and guys; neither is the Axial.
Axial is a crawler not a Nitro 4tec.
