I am thinking about a sequence of space tether development missions starting with lowering 
payloads to the moon.   Something like:  
    http://spacetethers.com/moon1/

The smaller the payload size the cheaper the total mission will be but I would love to have
payloads that were big enough to have a chance of going around the moon's equator fast enough
to stay in the sun.  

     https://grokipedia.com/page/sun-synchronous-traversal

At the equator the rover would need to average 4.67 m/s or about 10.5 MPH. 
If we are 85 degrees it is 0.37 m/s or about 0.8 MPH.
Please make a table with columns for:  latitude, speed m/s, speed mph, km per Earth day.
And latitudes of 0, 60, 75, 85.

Thinking of having 10 rovers working together (sort of a swarm of robots).  
If 10 hooked up like a train, we could have redundancy of solar power, plow, steering, drive motors, radio,
positioning, cameras, etc. so that if one part broke on one rover it could still contribute.
If the lead rover steering broke the train would have to swap in a different rover as lead rover.
With the right design, many parts could fail before the train really failed. 
Sort of a distributed and fault tolerant solar-electric locomotive.

The following rovers in the train are rolling on compacted regolith, so the rolling resistance is lower.
If power is shared or it rotates the lead rover position, this makes things easier.
If rovers do regenerative breaking they can share power even without an electrical connection.

The hook up could be such that the front steering wheels of the following rover were off the ground,
so each will follow the one in front without using steering.

The hook up design must be something so that either the front or back rover could disconnect,
so it is never a single point of failure.  

The tether would drop each 10 kg rover one at a time, so the first job of the swarm would be
to assemble together.  The distance between the drops would be about how much the moon
rotates in 2 hours at that latitude, so about 2 times the average speed the rovers 
need to have to stay in the sun.  But the first rover can start moving so that it is
not far from the drop location by the time the second is dropped.  Then those 2 can
move together and be near where the 3rd is when it drops, etc. 



Seems like trains/swarms of 10 rovers of 10 Kg each might be plausible?


Thinking we might get 10 Universities and let each of them have 10 payloads of 10 Kg each,
so we have a contest of 10 swarms, one from each university.  And universities might
even work together, like take turns leading.


The universities would be allowed to use their 10 payloads of 10 kg each any way they want.
So perhaps they have 5 tiny humanoid robots and 5 push-carts, or whatever. 

Could have a plow that was used for particularly difficult terrain.  To average over 10 Mph
it would not be used most of the time, but it might help get out of a jam.


Please flesh out and present the above ideas while also evaluating them.
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