Our LRDG Chev

[Lynn Eades]

Andrew, Run flats usually have a collapsable (jeep is not) steel ring in them. They can rust to the rim as well.
R.H. in Hamilton had some halftrack runflats that were solid all the way through with a soft red rubber inside the tyre (permanent in the tyre, non inflateable)
Run flats were identified by type RF1, RF2, RF3. I cannot recall the differences.

Can you try setting the wheel up on solid ground,(concrete?) park the tractor on one side and then drive the digger onto the otherside as close as you can get to the rim. You will probably have to relocate a few times.
Be careful!