[jijiglobe]

One solution to the T-boning problem that is much simpler to implement is to make your bumpers out of different types of fabric. Many teams use a high friction cloth (such as emery cloth) for their front and back bumpers so that they can T-bone other teams, while using low friction cloth (such as sail cloth) for their side bumpers. so that other teams have difficulty T-boning them.

EDIT: Emery cloth is way too abrasive to be used on bumpers