I guess the mice have chewed the insulation.Additionally, the drywall at basement detected moisture.

Moisture Issues2.

Moisture, subfloor conditions etc can also cause gapping.

Did you complete any moisture tests to confirm there's no mold growth?

It grows in one location because there's excess moisture allowing the mold to take proliferate.The first step is to figure out the source of moisture.

Overflowing gutters, a leaking roof, or holes in the siding may lead to moisture entering the mobile home and problems/mold in the wall cavities.Worried you’ll miss something?

If the tenant identifies an area of moisture that may be causing growth we immediately address the source of the moisture, replace and damage building material (usually dry wall) and or use mold cleaning solutions/mold blocking primers as required. good luck

HVAC duct work insulation is also deteriorated.No vapor barriers installed eitherSome fungi/mold growth notedPlumbingMultiple small leaks under sinks and from bathtub and toilets.House has Polybutylene plastic plumbing which is dangerousMain shut off valve is damagedElecticalSome small exposed wiring and bad splicing.Whole house has no GFCI's or grounding outletsInteriorMoisture spots on ceilingExteriorLose Vinyl SidingDoor Jams and Window trim have moisture damageDriveway need replacementRoofingMinor leaks noted in atticRecommended to replace roof covering, but not whole roofSome fungi growth noted in roofSo some of the question I am trying to tackle with this work is:How much should I budget for the main issues listed? 

This usually involves using ground-penetrating radar (GPR) to scan for the remains, but there was one small problem—GPR is only effective up to about 15 feet deep.

I would not reccomend them at all in you are in an area of with alot of moisture or rain.