I believe that all TMs have the skids Bob describes. I know my old '02 2720SL and my new '06 2720SL both came equipped with them. They are not very wide - maybe 2 inches - and I suppose they could gouge an asphalt surface if the skid force was high.
You might also consider backing up until the skids almost touch the pavement, then putting a couple boards behind/under the TM tires to raise it a bit as you back up further. And of course, release the springbars before you start, in order to lower the hitch and raise the rear bumper.
Heavy-duty casters could be added, but you would have to get someone to weld some mounting plates onto the rear ends of the frame members.
Bill
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