I know you are a Dancing with the Stars watcher but if you are an American Idol watcher as well I offer the following advice that is often given to singers by Simon. Pick your song to showcase your skills that is memorable and will make you look good. Bike racing is similar. Pick races that match your skill / fitness/ weight and etc.

A short slightly uphill TT will favor big strong guys who can go anaerobic and produce a lot of power for a few minutes. I do not think weight is going to be a big factor. And this is a LOT of power very fast so the chance of injury goes up. So be careful. I would do it but unless you are ready for a very tough short effort, just ride it within your capability and let the time be what it is. You do not want to take yourself out sprinting for DFL.

My other thought is that this short TT will attract a lot of first time " It is short and safe and I can do it too" guys. You should be competitive with or beat those guys.