WOW Jim
Thanks for your explanation, you really do have the determination to build the great wall in China.
Let me share i've been inspecting RE for 30 years & have one of the most expensive crazy built trailers on this forum, so I know a little about RE & building trailers.
You can look at my trailer under
http://overthetopcargotrailer.blogspot.com/ MtnDon - also is building a smaller - less expensive version of my trailer.
MtnDon build starts here - he is also in a hot & cold climate so I would recommend you follow build to the letter - if you wanna live inside yours
http://www.tnttt.com/viewtopic.php?f=42&t=58336you are gonna need insulation up the wazoo & done correctly - so I would recommend mine or MtnDon - which is also your size.
if you follow those directions you can cool with a $100 wall a/c and heat with almost nothing.
So I hope that helps for your trailer build
In view of your house, your correct you would need to hire an Industrial hygienist - and the bill starts at $1,000+ KaChing
If you house had major remodel new sheetrock 10 years ago & you have rusted copper pipes - Chinese sheetrock.
if your house is very old 30+ years - generally I would start with some kind of water leak in the basement.
There are 27,500 different kinds of Mold - all houses have them, 99.9% don't make you sick - but the bad ones will kill you.
Mold needs a constant water source, food source & normally high humidity. A little 12" spot somewhere won't make your whole house sick.
You could really have a soft and moldy bath floor & shower walls ?
if you have central a/c then you could also have some mold sh** in your ducts ? if you could have someone look at the ducts and MOSTLY the evaporator inside to see if they are clean ?
Its quite possible there is something in the water - have you had it tested ?
its possible there might be a underground gas station leak that is migrating into or under your house ?
Is it possible that there is a cancer cluster in your area - and many others are sick ?
you might also be environmentally sick " sensitive "- to stuff thats in the air (( i'm sorta like that )) a 5 gallon gas can in the basement would do it for me
HERE IS A CRAZY THOUGHT. Why don't you call 10-20+ local home inspectors in your area or within 30 - 50 miles...
Tell them about your medical situation, section 8 & your sick cats & dogs, YOUR BROKE and see if some of them would come to your house & snoop around a little ? PRO BONO !!
you would actually be doing them a favor - because they normally never get to see this kind of misty. We just see the same boring sh** day in day out.
I'm in Calif but if you called me with your story , or sent me an e mail / letter, I would be more then willing to come snoop around your house for an hour to see whats up ? No CHARGE !!
Generally if your house really really has a problem one should be able to see or smell or taste something, somewhere ??
If you find a big problem - then have your landlord sell the house & look for a new place....
since you guys seam to be best friends - & have great relationship.
If you really wanna do the trailer thing I and MtnDon would be glad to help....
Personally I'm up to the challenge to see if it can work
but I'm saying up front your trailer idea its gonna be a really tough row to hoe....No one here lives full time , with 8 pets in very hot and very cold climate....
so there is NO GUIDE BOOK ....for your experiment or guarantee of success.
Cheers Jerry