I can't remember where it was I saw it, but there was a fella on one of the mog forums who had bought a set of small car wheels/tyres and drilled them to fit the mog studs. When the truck went away for the winter (it was a mint 406 so summer use only!) the little tyres went on and he could drive it into the workshop.
They were seriously bodged on and fitted the wrong way around because the disks couldn't fit inside the wheel, but they did the job to roll it in and out. Once it was in he put it on stands anyway.
You should make a set - you'd be able to drive all your mogs in if you wanted to work on them in winter.