If anyone is having trouble keeping their harvesters up I have an idea... What I do is get 2 destroy missions for about 2.5k a peice that are heading in the direction of my harvesters or Crash's house. Then I go do the missions (which are fairly simple because most times they are just gnorts) and receive the money and since i am near my harvesters i can stop by there... grab the resources, fill my harvesters up with enough money to keep them going for a few days and then I go and drop the stuff off at Crash's house (lucky for me it is only a 2 minute run from my harvesters) and that leaves myself some time to go get some quick kills right outside of Theed and when I feel that my harvesters need to be emptied then I go get 2 missions... do those, get the resources, put even more money into my harvesters to keep them going for twice as long and then drop my stuff off at Crash's house and repeat this for awhile. Works very good for me and I even get to help myself by earning some exp while they mine. Some it may not work as good for.
What I do is, pay up all 36 harvesters I am running for 3 days at a time. I hit the power plant, grab what I can, get cash from Crash for the difference. Power/Maintanance each harvester to 3days, and then come back in a few days rinse/repeat. 3days at a time for multiple reasons.
I got 6 Alumium Harvestors and 3 Wind Machines. Cypher exactly what reasources do you wanted scouted? More Aluminum? Cause there are higher concentrations nudging 80 outside of Theed.