Does it need exterior painting? 

Install a couple exterior lights and a fence if the security is that big a concern.

Installed 700 sqft of LVP from Lowes for a total of $2,250 installedInstalled 4 new cabinets in the new kitchenette for $800Painted the entire interior trim/ceilings/walls for about $500 - did this ourselvesPainted the entire exterior for about $500 - also did this ourselves Still to come: New countertops for downstairs and upstairs - $2,500 installedElectrical panel upgrade and other electrical - $3,000Fence - $4,500Front deck - $2,500 We've learned a lot from this project and I would say two major takeaways right now are:Find better deals so that you can avoid doing any of the labor yourself and focus on finding future dealsFind a better GC relationship instead of trying to half GC ourselves and half GC with a GCWe're running into some trouble with the refinance at this point due to a lot of lenders putting a pause on their rental loans for investment properties.

There could be potential exterior wall damage that is in the quote. 

My scenario for my question is: I purchase a duplex to BRRRR it, have one side occupied/rented and I occupy the other while rehabbing that unit and the exterior.

This home features brand new Flooring, carpet, brand new kitchen, all wood cabinets with soft close drawers and hinges, quartz countertops, new stainless steel appliances, new fully finished bathrooms, new interior and exterior paint, new central HVAC, new dual pane windows, new roof, new water heater and all new lighting throughout.

Over the decades, "leaky air systems", bad plumbing, years of moisture causing rotting wood are "termite magnets" for older mobile homes.

If you think load bearing (these are usually exterior walls) were modified that's a little more rare, you might need an engineer. 

They would rather waste to postage and call.You can get on their list for most any reason, just the right neighborhood they invest in, an unkempt yard or exterior, tax bills sent to a different address, etc.

I had some of the brick replaced on the exterior layer (there were 3), with few issues.