Hi Michelle,
I had my old 6" dob sitting on castor wheels and it worked like a dream. I like the long tension handles on the Saxon's as they enable me to drag it around on the wheels. My 10" is also on wheels. Castors alone, I don't think is such a good choice for such a large dob as a 10". The scope is quite heavy so you really need bigger wheels with some shock absorbency. Having said that, I still have not attached my pneumatic wheels on and am still using normal large wheels and it works fine, just have to be more careful and take it steady over the bumps.
I have attached a wooden frame (2 pieces) under the base (the frame protrudes a bit from under the base so the wheels sit either side of the base (not hidden under the base), and attached to it are two large wheels (pneumatic wheels are better) and two castor wheels. Again, I pull it around using the tension handles. I like having the castor wheels along with the larger wheels as I can move the the scope around better. Bunnings have trolleys for only $20 and many people use this as a way to move the scope around, then you strap it on to the trolley using those expandable tie thingies. I bought the trolley just to take the pneumatic wheels off it to attach to the base of my scope- their normally quite expensive so for $20 it was a bargain. When you drag the scope around, just take care over bumps, pavers etc, nice and slow.
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