Jason what surfaces do you want this to roll on ?
Many years ago I made a trolley to carry an old-school 8" f/7 newtonian by cannibalising some very wide wheels from a kids trike, they worked a treat - reasonably stable even on grass. A large contact area (ie wheels that are wide with large radius) are the key to stability and a smooth ride on rough terrain. For the same reason 4WDs have big fat tyres not skinny little wheels like a Mini, or a Daihatsu Charade.
Skinny little wheels like castors will be a total PITA.
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