Hi Bathurst 77
Castors, (the lockable one's!) on the base is not a bad idea..I have seen, however, a trolley-base specially made with 3 heavy-duty braked rubber castors as well as screw-down lockable feet to keep it stable...and don't worry about collimation too much..it's not that hard to do..just time consuming the first time you try it..and like the others say..just a tweak for fine tuning after a trip!
Cheers!
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