However,  for a variety of reasons it can't be done - you can't find a vendor, it's a holiday weekend,  parts aren't available, vendor flaked out etc.How and when do you set expectations with tenants for how soon repairs can be done? 

Your vendor should be available and communicative.

@Felipe Ocampo I think your question boils down to timing the market (you might get lucky but not likely possible) rather than the merits or challenges around turn-key vendors. 

Websites, catalogs, companies, trade shows to me vendors whatever.

We are wanting to put a truck stop, drop lot, and truck wash for starters,(phase1)Then reach out restaurant vendors, like red lobster, smoking bones, Bahama Breeze, Cheese cake factor and so on.

I would love to see a much larger vendor area with a better set up as well.

Enter a maintenance request, assign a vendor, attach a fake invoice.

Not to mention payroll, overhead, and most vendors had net 10 terms.

Unless you're doing this out of charity, I'd consider him as no more than a trusted vendor who gets favorable terms.

If the property was in the unsustainable bracket a small change in inflation could force vendors to start liquidating and thereby create a greater supply of product on the market and thus drive prices down.