Thank you very much for your suggestion.
Yes, yes, steering behaviors and flocking... It does solve some of this issue(keeping a steady distance in transit), but what I need is for my units to remain in approximately the same formation when they arrive at their destination as they were when they started moving toward it(keeping same distance on arrival). And, if the behaviors you mentioned help solve this, I certainly don't see how. Can you elaborate on which specific behavior I should try implementing here?
The units I'm using are going to be spaceships. So, if you imagine the way several command ships (battleships, carriers, destroyers, frigates, etc) would move in formation, that's what I want. Though, of course, I'm working in 2D...
Again, I see this "formation" mechanic in almost all rts games. So, I thought there would be some simple equation to work out a range of destinations allocated per unit instead of a single destination given to all units (which is what I have currently).