This will vary on a case by case basis.Basically, it's best to start to meet and talk to everyone you can.

The amount of rehab has varied among the few contractors I’ve had look at it.

Int% rates vary on amount down but negotiable.   

I want to pay him fairly, i think it should be a percentage of the fee since the amounts vary drastically for us ($5k-80k)

I guess a good way to frame the question is, how does a prospective property for wholesale vary per location?

Does the law vary by state?

Gives you a great assessment of the varying levels of risk in each neighborhood you look at in that market.

@Frank Rolfe In the situation John Brinkos described above, it seems like he has two very different properties:  1. one park that is a strong performer with seeming low complexity (due to low POH %); and 2. one park that is a weak performer.In your experience, have you found that banks and/or agency lenders and/or conduit lenders are willing to lend on a portfolio of 2-3 MHP’s even though they vary widely in their characteristics and operating results?  

Laws on this subject vary between states.

Both of those parts have a service life of so many seasons dictated by how long your hot season is.Capacitors vary in quality/lifespan.