Considering I buy all units second hand, even if I had to swap one per year I would be way ahead.

Might swap skills so to speak with a mortgage originator.

You might consider buying spare filters, so when you go for a maintenance visit, you can just swap in a clean one and take the old one back with you to wash later.They should tilt towards the outside of the house a little bit, so the condensation drips out the back.

This is the trailer where I had to fire my "contractor" 2 weeks in for some MAJOR screw ups so all the flooring, painting, fixture swaps, and drywall I did myself

If you're a cash buyer or using a commercial loan, you can also try a drop and swap!

An immediate swap would eliminate the risk that the switch to a final sales tax would be only temporary, a failure common to past Tax relief efforts.

And what type of financing products are you using (30 yr residential, 5 yr commercial, swap rates)?

Many of our clients strive for the "swap til you drop" tax planning strategy. 

You can swap rate for fees, fees for rate.

You can swap fees for rate, rate for fees, all day long.Typically most of the line-item fees you are looking at are 3rd party fees.