Another vote for the 6 ton set, which I recently purchased. Good points on safety raised. You don't want the adjustable bar raised above half its length. Try the 3 ton, in the store, and raise it to the typical height you wuld have clear underneath the vehicle, and see how side-to-side floppy it is, and the small 'footprint' of the base. Not a very reassuring setup! Bigger is better for jackstands. I just pitched a set of jackstands that were probably 6 tons, they were old, and started to rust to the point they needed to be scrapped.
I use a piece of plywood under jackstands on asphalt to keep the legs from digging-into the asphalt, since they do not have wide flat surfaces on the leg bottoms. And, yes, chock two wheels, not just one. Redundancy may save you one day.
As was mentioned, I also leave the jack under the vehicle after using it to lift, and placement of the jackstands, loaded with the vehicle weight. At times I have used the full wheel/tire under the vehicle to provide a safety margin.
I recently bought the wheel dollys from HFT, to be able to move a vehicle around inside the shop. I am space limited, so these should help in being able to do work.
I check and re-check about the pawls being engaged before I remove the hydraulic jack, and a few times in near 50 years of working on vehicles, have found them to be not fully-engaged.
I have used and still have a pair of pin instead of pawls jacks, and the shear strength of a probably 3/8" steel pin is fine for the use.