How much weight will you be putting on the dollies?
I have heavily used four Harbor Freight wheel dollies with my 1/2 ton trucks and to move around cabs on timbers.
One pair is 15+ years old and has been indoors and outdoors for long periods. I have had to oil the ball bearings after it has sat idle for long periods outdoors.
I'd now buy these dollies, if I needed any - these might stack better than the ones above. (I'd also probably wait for them to go on sale for less)
