We have had the same problem
The answer was on this forum a while ago.
It suggested and that is what I do
Get a few 12inch long wood strips and a few 6"2 0r so ong start with the 12" and built up using the various strips using your mover a foot or so each way.
It was also suggested that if on hard standings use a mat between the wheel and the stone to prevent stone embedding in the tyres and damaging your rollers.
With the regard to the wood no doubt some tech wizz out there will explain it better.
I have used in this year on pitches I had struggled with on previous visits, a doddle