Things like shredders, locked computers & cabinets are all required.

It will irritate you when your paying several hundred each month in utilities.

Excellent quality appliances 2-3 years old often sell for a couple of hundred.

Most people are capable of drywalling, putting flooring in, installing cabinets, etc. 

You may be spending hundreds or thousands of dollars per year to protect what?

Not that I've ever done it...but I've bought from wholesalers and declined about a hundred times as many deals as I've bought because they weren't good enough for one reason or another (usually insufficient rehab allowance or over-optimistic ARV projection).Now, on to your question. 

Does anyone know of a kitchen and bathroom cabinet dealer that sells rental grade cabinets in the Stuart, West Palm Beach or Port Saint Lucie area?

I've worked with literally hundreds of contractors, many of whom I've had VERY good relationships (I have contractors who have been working with us for nearly 10 years and we go to each other's kid's birthday parties). 

The goal is to obtain hundreds of properties, so this made me wonder if I should have hundreds of LLCs to go along with them.

But of the 1 or 2 in 10 that will be an absolutely no, there will be another 4 or 5 in 10 that will have no problem taking the house even in the craziest condition ever.I've shown houses with no flooring (subfloor only). no cabinets, vanities, light fixtures.