I'm yet to put wheels on any of my cabs, most of the time it's just me hauling stuff about so I invested in one of these beauties

and it's about as good as it gets. The big pneumatic tyres mean you can haul them over pretty much any ground and also helps hauling things up steps. Make sure the heavy part of the sub is at the bottom and it's a doddle to move them about.
As for the T60 being too big, you realise you can stand it on end, right? Fire it at the ceiling and then your footprint is as small as any other cab really... I popped a speakon in the cut out section by panel 9 as well as one on the back.

This way I can stand it up if I need to or I can just connect it this way when they're sat in a corner so there's no cables running out of the back. The speakon is fitted into a ridiculously tight hole with a bunch of gasket tape all around it, trimmed tight. As you can see, no chances were taken with this leaking...
