You should have no trouble having the buyer getting a conventional loan, especially if it hasn't been moved except for delivery.

Buyers consistently received bad service from selling agent such as late communication, late delivery of required documents such as lease agreements required for loan/bank (2 weeks late for 2 of the 3 lease agreements with no tenant/owner signature and haven't received 3rd lease agreement) as well as selling agent did not give notification to 2 of the 3 tenants for loan appraisal so appraiser had to come twice to property, all to which has delayed buyer's loan.

I looked at a used stackable W/D set, 24" wide model, which will fit just right in the laundry closet, for $400 with delivery, or $525 with 1 year warranty.

Spoke to sales and was told delivery,setup, foundation and septic field would run abt $20k.

You can look into other ways to accept online payments and talk to the tenants about using a different service that is more efficient.Talk to the tenant and calmly and professionally tell them the expectations: That the rent will be in your hands by whatever date, regardless of their delivery method.

The delivery guy might hate me with a burning passion, but whatever. 

Will be providing them an opportunity of about 150k RFQ/PO for a client of mine in the next couple of weeks, I asked for ground drop on all materials and single day delivery without fee they said it wouldn't be an issue.

Hello. here in San Diego if you want new then home depot is where I always go they make it easy with the delivery included.

Title insurance, various recording and delivery fees, etc. make up for the rest.By 6%, you are referring to agent commission?  

Assuming you sent the non-renewal letters via Certified Mail, then that receipt serves as your record of delivery/notice (even if the tenant claims he never received it) The clock would be ticking from that date of delivery or attempted delivery.