ORIGINAL: fhm101
I hate to break it to you, but ANY twin will be impractical as a regular race truck. I've seen twins run exibition races from time to time, but I have never seen one at any of the races I've been to outside of RC monster jams. A single engine truck is more than enough work for a regular race truck.
If you read my post, you'll see that I said nothing about racing... A twin can certainly be used for normal use (as I stated), and with more twins becoming available, you will see them more and more when you're out weekend bashing.
For the most part, it's for kicks, but it does give you massive combined torque without losing top end. I agree that you'll most likely never see a twin racing. It just adds unwanted weight, and there is no need for crazy torque on a track.