Exactly, extra armour isn't going to stop a tank in its tracks, they have 1500hp engines for crying out loud. Also if they are a bit slower, what does it matter in urban combat, only in the open can a tank really open it up.
One pic that I did see looked like a good idea for urban patrols. It was a photo of Aussie SAS, the lead vehicle was an Australian Land Rover with mounted MAG58, and the rest of the patrol was following.... On Yamaha big bore trail bikes with rifles slung. Brilliant idea. Fast, manouverable, and able to go all terrain. Plus it's easier for them to split up and move off to pincer the enemy.
Look at the fact that we've had Australians patrolling Baghdad day in day out from the day it was taken and we've had ZERO deaths. We've had casualties, don't get me wrong. It's because we are using more progressive patrol methods and vehicles/gear/tactics designed for the environment. We had out first real go at urban tactics in '99 in Timor.
Before anyone comes on here and says that Australians aren't doing much in Iraq so that's why they don't get hit, let me tell you that is wrong. We've been working our butt's off over there, and we don't have the "green zone" to go back to either. We encounter just as many IED's and road side bombs, just as many RPG and mortar attacks and we are just as big a target, many Iraqis don't know the difference between an Australian and an American, so why is it that we have ZERO dead? Training and Tactics.