Not to argue or contradict @Ken Rishel as I respect his knowledge, expertise, experience and obvious success in the MH Industry, however, one thing I've personally experienced over the years as a General and Manufactured Contractor, Manufactured Home Dealer, Real Estate Broker, Developer, investor and property manager (my own portfolio) is that in park sales personnel, be they the manager or an in park sales dept., is that it can be construed as somewhat of a conflict of interest to residents wanting to sell their homes if they feel they are obliged to list their home with an in park employee vs a RE professional or MH dealer of their choice.
There are a few MHC's in my neck of the woods who have done and some that still do this and the homeowners/tenants really resent it and often opt seek their own representation. I've actually been retained as an expert witness to testify against MHC's who have all but threatened their residents and tried to ban outside sales of new and existing homes, require homeowners/tenants to go through their in house sales staff and contractors. Guess what? They lost in every instance. Bottom line America isn't a dictatorship. It's a free enterprise and capitalistic system and no one is allowed to restrain free trade. At least not yet.
I have a friendly competitor who lives in a very upscale MHC in a very popular coastal community. His MHC is in a rather messy lawsuit because they threatened to evict him if he kept selling and/or installing MH's. This community owner and management team have set up their own in house sales and construction team and have attempted to refuse any outside competition.
It's not going to end well for them. In fact if it goes to trial by jury the plaintiff could be awarded some pretty hefty punitive damages at the end of the day. I've actually been involved with cases where the punitive damages actually forced the MHC owner/s into bankruptcy and lose their investment altogether because they couldn't pay the punitive award which to my knowledge is not covered by most insurance companies under their personal liability policy.
Just a thought.