We often think about tillers, shovels and hoes when when thinking about garden equipment but if you are selling greens there are two things that I have never thought of that could be very useful.
If you are going through 100 lbs a week or so: washing, drying and storing your crops before sale can most definitely be hard (never sold before so I’m guessing and planning).
For salad greens at home we use a salad spinner that works really good for about three salads worth of greens but that would be hard for market quantity of salads.
You do need to make sure you can legally do it in your area but a clothes washing machine would work well. The greens need to be in bags that allows water through, bags with greens go into the washing machine for a quick spin cycle of 5 minutes or so and all the water is thrown out.
The other more expensive thing to consider is a walk in refrigerator. I have looked for a while and never see very good deals, if you can get one and have a place to put it it would be very nice. Another option would be getting a big kitchen fridge or modify a stand up deep freezer. For the deep freezers thermostats can be purchased that will work the freezer like a refrigerator with temperatures in the 40-50 degree range.
If I am able to go big enough to need a walk in refrigerator what I have leaned to is a refrigerated trailer. From what I have found the price is about the same and the trailers have a generator. I am far enough out in the sticks that going into town to sell my produce our of the refrigerator is appealing, additionally the produce may be able to be packaged at the garden and put straight into the refrigerator instead of having to handle it an extra time.