We live just outside of city limits and therefore Coconino county. 

Since the contributions have to come from the business income (PM biz) it’s not likely you’ll come close to taking advantage of the high contribution limits of a Solo 401k.

Rising land prices are not that common either, and limited to select areas.  

3) Any specific states you recommend to set up any of these (Not sure where I'll be purchasing property yet, maybe Detroit, maybe Cleavland, maybe Augusta, maybe Des Moines, maybe Saint Cloud, maybe Memphis...)4) I already have a LLC based in Hong Kong (We call them limited companies, but the principle is the same).

Here is what the IRS says on the subject: Election for Husband and Wife Unincorporated Businesses A business owned and operated by the spouses through a limited liability company does not qualify for the election Only businesses that are owned and operated by spouses as co-owners (and not in the name of a state law entity) qualify for the election.

So money can be made.The downside of syndications is that you have no control of the deal as a limited partner...  

Credit cards have the same limitation on the amount you can borrow and will likely end up costing more than private lenders.

Sometimes the tenant just doesn't know about them or their situation limits their ability to apply.

it does allow you to repair things outside of the home to a limit. 

Exactly  its why I only respond to limited PM's.