You typically wont find a park inspection, break it out into subcategories i.e. septic, electrical, water line plumbing . Find a reputable vendor that can do an inspection , tell them you need to know the condition, have them write up anything that needs to be done. You also want to sort through the existing financials to see if there are a lot of repairs, high bills etc.
If there are POH for other structures , you might consider getting a residential inspector or commercial for that component. You can also do this in a whole but i feel the breaking down of specific vendors is the best method. most times an inspector will say, " recommend you get plumbing contractor to evaluate "
Also, make sure you check the existing vendors, you can learn a lot about possible issues , recent work, what type of work etc. If the vendor the park is using is one of the top vendors, get someone else to eliminate the risk of collusion.
Congrats are you going to Texco ?