Quote from @Andrew Steffens: Smaller units have longer average bookings in my experience. 

If that’s your question then the answer is because the seller may not have the knowledge, experience, time, ability, energy, to successfully conclude the transaction without “help”.  

Does anyone have experience renting one out as an MTR?

I feel you have WAY more experience then I do! 

I work with a lot of househackers and they're typically on the 12 month cycle, rinse and repeat.While the proposition of acquiring an investment property outside of your market in a "landlord friendly" state may sound appealing, i would recommend you stay local for now and househack another couple of properties over the next few years until you've got some more time / experience under your belt.you would need a management company to cover your property that is outside of your market which would not only take 8-10% of your gross it would also leave you a bit vulnerable to a property management company that you A.)know nothing about and B.)you won't have the experience or cashflow or proximity to deal with any headaches that may arise.i would recommend staying local and househacking your way along for now and then maybe hire a local property management company initially to work with your current/local properties to get a taste of what to expect if and when you begin investing outside of your market.

I’d love to hear your experiences—hoping to soak up some wisdom as I figure out my next steps! 

Your experience with rehabbing2.

Has anyone had experience building modular homes in Fort Lauderdale?

I'm not sure about your partner here if he has the backing or experience as an engineer but my experience with engineers is they don't have practical real world experience like you have by doing projects all over the nation. 

I would like to know if anyone has had experience with GMG Asia as well.