Yup, its a Maverick DUC32 and the black thing at the rear wheel is actually part of a bike stand. You can see a little of the rest of it just at the very bottom. Sweet bike, especially for someone of Kabush's stature.

 Travis was rockin' the sideburns long before Kabush, heck Kabush was still a little shaver when Travis was racing!

 is the fork a maverick?

and what's the black thing on the rear tire?

 HAHAH. I mean Travis's stature..