If your marina has good sturdy dock carts, one of these and three or four people will get the job done pretty good. That's what we did although we didn't have that weight of chain to deal with.
Depending on the layout of one's marina, it may also be possible to take the boat to a loading dock of some sort and load the chain straight from shore (back of the truck, whatever) to the boat. That's something we can easily do in Bellingham marina as it has a good sized commercial fishing fleet and so has piers and shoreside facilities for loading seine nets, big stacks of crab pots, etc.
We once saw a fellow loading a lot of new chain onto his GB 46 at the self-serve crane dock. Boat was in one of the slips facing the bulkhead and he and friend were passing the chain straight from the back of the pickup down to the boat's windlass.