I think the standard is pretty good, and just let it evolve as you do, adding or subtracting what seems relevant. 

To make it easier, I subtracted the $80k from the $280k purchase price in the BP calculator.View My BiggerPockets AnalysisMobile Homes in the ParkProfit & income is as reported on taxes:

The capital gains tax is only on what your "gain" was ... you take the amount you received at sale, subtract commissions and transfer taxes and any costs of sale (including fix up costs) ... and you subtract from that amount (your "net") ...everything you paid for the property.  

After you subtract out rent, utilities, internet, etc. we're still netting over $1k+ per month.  

It appears the formula for calculating the > than 50% rule, subtracts the hours on short term rentals (or rather adds them to the w2 hours) in the calculation.

Reach out to cash buyers in those neighborhoods and determine their buying criteriaAnything that needs to be changed, added/subtracted to my current process?

Drive the area and call for-rent signs.Now, having the rent, subtract 50% for expenses, vacancy and capital.

You can only borrow whatever is left after you subtract any current applications of this (loans) from the allowable maximum allowed by the policy (see #2 above). 

Every time the water and gas accounts are started on a new acquisition where the copper plumbing was stolen, I still get a minimum bill for zero usage (after subtracting the customary one time account start up charges).

Do you assume the worst and subtract accordingly from your offer?