I hope they get moved every couple of weeks of they are full of fluid! There will be flat-spotting of the wheels, journal bearings, and corrosion build on the bogies, plus concentrated weight on the tracks in one spot (especially during spring thaw) to be concerned about.
The flat-spotting of the wheels or the bearings reminded me of a tour of a gas turbine generator plant I was once on as a college class field trip. It was one of those small plants used for peak demands. Turbine with basically 2 jet engines on each side pointing at top/bottom of the generator turbine. There was a geared motor running to keep the generator shaft turning very slowly whenever the unit was in a standby state. The tour guide explained that was to prevent the bearings from getting flat spots from the massive weight of the shaft and rotor.
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