I have an older but in very good shape 2000sf double wide mobile home. 4bed 2bath central air/heat. 

It might help you sell the house since you can indicate that it has been upgraded.I would do what is necessary but not go overboard.If you have galvanized, replacing the water line from the street to the house makes a hug improvement on water pressure as galvanized will rust and restrict the flow of water over time.I believable you just need to have working plumbing with good water pressure for the appraisal.I would be more worried about plumbing issues or old piping showing up on a buyers inspection than it affecting an appraisal.

., former employer 401k) to a solo 401k are not reported on Form 5498, but rather on Form 5500-EZ, but only if the air market value of the solo 401k exceeds $250K as of the end of the plan year (generally 12/31); When funds are rolled over or transferred from an IRA or 401k to a self-directed IRA, the amount deposited into the self-directed IRA is reported on Form 5498 by the receiving self-directed IRA custodian by May of the year following the rollover/transfer.

Have him inspect the gas service by doing a pressure test of the house.

@Carl Fischer  I had looked into opening a self-directed Aire as well in order to invest in real estate… Just have never pulled the trigger 

I'm guessing you have considered this, but one way to get the benefits of rental ownership and still have intermittent access to your property, would be the Air BnB route.

Will they have enough water pressure?

I'd like something that's relatively cost effective, so central air is likely out of the question.Does 3 zones make sense?

We have a warehouse with no access to cool air coming in.

If one of us loses job, we will be under a lot of pressure and even may need to sell it - or we need to sell our only investment property a multifamily in Boston to save it.