One question if the moorage can accommodate those sort of customers. 

Are the schools able to accommodate a new subdivision of children?  

Keep going until make a swing through the top 10-12 parks (not all parks can accommodate a 42 footer).

Another relatively inexpensive way to get into the game if you own some land is to purchase low cost accommodation alternatives such as glamping tents, or geodesic domes. 

Sometimes it is easier to just make people happy by accommodating their request.

My in law also live with us about 6 months out of the year. within the next 12-24 month and am looking to buy a larger home that can accommodate all of us.

Are you on a fixed income and is it substantial enough to accommodate today's home prices?

For me, my cleaner is super accommodating and is willing to go to the property when things need to be taken care of, particularly for something cleanliness related like unclean sheets, not enough toilet paper, etc.

Where should I look or post to find other people like myself that want to build their own SFR and maybe find a lot together that could accommodate two houses 

I might just put something about 3rd floor accommodations, sloping ceilings.