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Yes, castors can be a good idea, BUT USE ONLY 3!
Use 4, & you are introducing a potential rock incase where you set up the scope isn't even. Weight distribution isn't a concern - just make sure that the castors you select are rated each at no less than the weight of the scope + mount.
What is more important for distribution is the placement of the castors. If the azimuth bearing uses Teflon pads, place the castors under the pads. This will prove most stable for the mount. If your az. bearing is a Lazy Susan type, place the castors at the same radius as far from centre as possible, 120deg wide to each other.
Mental
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