Any suggestions on how you calculate the wholesale fees would be appreciated.

I would also provide a small line of credit to the partnership which I would charge for of course. 

Your $950/month on property B isn’t being “thrown away”.

Most of the big land wholesalers whole-tale the deals, meaning they actually buy/close on the land (using their own money or other people's money) and then list on the MLS to sell, because it is very difficult to find buyers without widely marketing it. 

I am doing research on a mobile home property that I was surprised to find available in my small town.  

I will PM anyone on this thread that was looking.

I'm renewing my LOC on one of my rentals with a local community bank through their commercial banking dept.

Sounds about accurate.What you should be focusing on is hopefully you are getting a return(Cash-flow) from your rentals and you are not paying tax on that.This would be better in comparison, to other investments such as dividend or interest income.

I do know changes to zillow are happening on the agent side soon where reviews and feedback will push you either up or down the ladder 

No idea on the paperwork needed.