Sorry to hear about your situation.
Not trying to discourage or deter you, but am speaking from experience as a spec home builder and subdivision developer for 30 years prior to being a park owner. Before you throw more money at the problem, keep in mind that your park is subject to compliance with the building codes as well as zoning. And the local building inspector can simply be a necessary nuisance or at the direction of a hostile city council, he (she) can become your worst enemy.
My understanding is that unless you’re buying used homes, you will need to upgrade your sites to meet HUD code for foundations and that adds a significant cost. I bought 13 brand new homes for two parks I own in MI last Fall, and had to tear up the existing runners and replace with 24" X 42" concrete footers every 8 feet for the concrete block piers to sit on. Add in drainage, utility line relocates, and other prep work and the cost was $3-4K per site. In both parks, the local building inspector applied the HUD code, and while they didn’t nit pick me to death, it was clear that they expected compliance. If the local building inspector shares the sentiment of the city council, you’re in for a head butting session that can delay your project for an indeterminate amount of time.
Just my opinion. Best of luck to you.