If you're equipped to play ball; go hard in the field. 

I plan on taking any extra cash generated from the business to not only buy more equipment but to also invest in properties.  

They need to walk into an apartment that is fully furnished and equipped with all their needs other than a laptop and clothes. 

Very comprehensive, despite your claim to the contrary.One of the topics you didn't touch on is depreciation of building, land and equipment.  

If there is a project next door to another job they already are doing, they can complete it with no equipment drop, so they should bid lower...but how much lower?

I have been doing research on buying, rehabbing and renting out properties for some time now, but it seems all of the golden rules (50% rule, 2% rule etc...) are equipped for states with much lower home values.

If this tenant bails too soon, you have the optionality to wrap the cost in to the next tenants rent, or end the lease and re-install your old equipment.

Should I shell out several hundred bucks and provide the stackable equipment?

I received a quote and was wondering, since the equipment itself works fine, and adding the insulation will reduce their utility bills by 15-18%/month, does it make sense to ask them what they'd like to do (i.e. ask for some help in the bill) since it's not absolutely necessary to the house?

Apparently, they used to house to grow cannabis, they left piles of dirt, tons of pots and grow equipment, and basically clogged all the tubs and sink drains.