If the insured on the property doesn't match the owner of record, you could be uncovered.  

Why are you assuming that a title search will not uncover the existence of a recorded easement for ingress/egress and/or a shared driveway agreement?

My larger question, which would likely encompass those others, is what types of professionals should I bring in to help me uncover any issues?

When I start looking at the recently sold properties, they always seem to uncover the Seller's high ARV.

The best way to explaining this is for you to download an IRR calculator spreadsheet or build your own simple one and play around with one.For what its worth most deals I deem meeting minimal IRR standards is 13-15% but you have to dig a little deeper to uncover the real placements of cashflows and capitalization events... and then dig even deeper to verify the assumptions such as occupancy, rent increases per year, and what reversion cap rate was used.Again I don't look for IRR cause its manipulated a lot instead I look at total return on a 5 year basis.

Since it's double wide, in addition to the 2 car garage for us, there are 3 uncovered parking spaces, coin laundry in the basement, and tenants would only pay for electric (heat is a boiler system and there is only 1 gas meter stoves are all electric, and there are large electric ac units sealed into the walls in all units).

Thank you @Bryan Vukelich , based on your feedback (and other input I've recently uncovered) it looks like we can check off this variable in order to get an offer made.

You can imagine how buyers feel when you tell them it's basically a take it or leave it situation.If issues come up you can remind the Seller and listing agent that, depending on what is uncovered during the inspection, they will have to disclose it to other buyers once they are made aware of it.  

you may very well be surprised at what you eventually uncover. 

., buyer) from hidden defects in title that are not uncovered (and in many cases could not be uncovered) during the course of a normal title examination.