Be sure that you highlight that "selling your house can be easier than you think" with the advantages of working directly with you instead of the more traditional route.

Manufactured homes may or may not include the land, most of the time you dont, which means you pay land rental fees etc, also financing are not as attractive, they are usually personal loans with high interest and not traditional 30 year mortgage.

Jack and Jill first time buyers that only use traditional methods of buying off the MLS may be buying at the top of their market cycle, but maybe not. 

Do you think it is better with the traditional way of just going with friends and family and building out your investor group? 

I will link a couple articles and will still swing back for more questions, but I mainly wanted to help the OP recognize that through the use of a Land Trust the Due on Sales Clause can be avoided.https://www.biggerpockets.com/renewsblog/the-traditional-llc-vs-the-series-llc-which-is-better-for-real-estate-investors/https://www.biggerpockets.com/renewsblog/2016/07/17/real-estate-asset-protection/

If you are buying and holding my suggestion is to do a traditional refinance so you can have a fixed payment. 

Many of which is already found in traditional rental agreements.

You're so right about the city's laws and systems, condo lottery, rent control, ellis act, etc etc create a crazy world, and potential windows of opportunity for value creation.. if you get the golden ticket!!

Buy and hold MFH is my strategy.After a few months I found a property which would meet my requirement of 15% CCR with traditional financing.

Paying a buyer's agent 3% is far more palatable to me than the traditional alternative.