[SteveGPage]

I'm going to echo all the posts above, and share our horror story. We built something very similar many years ago. We tested it on tile and smooth concrete surfaces, and it turned like a dream. We didn't have any carpet, and didn't think it would matter much. When we got to our first regional and took it out on to the field for practice, it skipped, shook, shimmied and bounced every time we tried to move. We couldn't control it at all. We had to pull two wheels off and replaced them with castors to even get some control. It wasn't pretty.

If you want to go with those 4 wheels, don't go with a long configuration, go wide. It will work a whole lot better. Otherwise, look at putting omnis on instead.

Welcome to FIRST and welcome to CD!

Good luck!

Steve