Even though they are all "mobile" homes, for a lot of them, they are as rooted to their lot as a house with a foundation, either because the house is old enough that it cannot be moved without falling part or it's simply too expensive.

And are there any restriction in your current mortgage that prevent you from executing this strategy? 

The best thing you can do to prevent it, is have a rock solid screening process.

The point of the OA is to prevent internal disagreements in the first place, if there are any issues that might currently be existing address them before there is an issue.  

Refinancing is typically only a good idea if you can get better terms than you have on your existing mortgage...cash out restrictions will limit what you can take...so, HELOC should be your first option.The alternative would be seek a new first position lien with you and your wife as applicants...as long as your DTI and credit are good...Renting the property you move from should not be a real issue unless you have occupancy (or other) restrictions that would prevent it...If you could fill in the pieces I could get you a more informed response. 

His practices & teachings will prevent a financial disaster but will never lead to wealth. 

(J) "Disabled licensee" means a person licensed pursuant to this chapter who is under a severe disability which is of such a nature as to prevent the person from being able to attend any instruction lasting at least three hours in duration.

The issue is when I am looking to buy properties they are often rented out, preventing me from putting low % down.

@Greg Lovern Borrowers frequently declare bankruptcy to prevent the foreclosure from proceeding.

I've found it's worth having binding documentation as it defines expectations and prevents future issues.Good luck!