We're going over. Our team has lots (read we did them in 2011, 2010, 2007, 2006, 2005, 2004) of experience with tank treads. We were going to switch to wheels, but decided to stick with our old standards. If you give them a 5" rise with an angle,
like a WWI tank, we should be able to get over the bump with ease. We've tested it with our 2010 bot, that has a 10" rise and angle, and it works great. A bit of a heavy landing, but we can deal with that.
I think many people are underestimating the bumps (just like the ball throwing endgame). If you save 5 seconds on each traversal of the field, by not waiting in line or going out of your way to get to the bridge, you save between 15 and 20 seconds per game. This could translate into another 'going across and shooting' cycle, or make the difference in getting onto the bridge. So essentially it nets you 10 points.