I built my own wheeley bars (for want of a better word) for my 10" LX200GPS. Take a look here for a pic that might give you some ideas:
http://www.iceinspace.com.au/forum/s...ad.php?t=86674
The base board was on good quality castors, located under the tripod feet. I also used leveling bolts to level the tripod up perfectly prior to polar aligning the scope.
Dean