I had a similar situation. My park is 300 miles away from where I live and I purchased used homes and had them delivered. I found my homes in Western Washington and shipped them over the Cascades to North Central Washington. Spent a lot of long days driving and looking at junk. I did get lucky and stumbled on a park that was closing for redevelopment (which was a very sad story in itself- greedy hateful owner and a lot of senior citizens with no where to go). I was able to go in and purchase six very nice older homes and had them moved over to my park. Interviewed and hired a good local teardown and transport team.
Long story shortened maybe try to find some local transport companies in the region your park is located. Tell them what your needs are and see if they know of any parks closing or other 'deals' out there. Given the triangle of distances you have with where you live, your park and where the homes are... you are going to have to find someone you can trust. Maybe you develop a relationship with the transport company and when they have a handful of opportunity homes lined up you fly out for a week or so and do the deals yourself. They get all the moving business so they would have some motivation also.
Another thought though is this. Moving those older homes was pretty rough on them. Ten years ago the teardown, moves, setups, porches, patios and repairs was north of 23k each. That was excluding the cost of the homes which I got a good price. Given the repairs we have continued to make on the homes over the years... I wonder if I would have been better off just going to a dealer and hammering out a deal on six new homes. Nothing fancy; no carpets; no blinds; no fancy fake trim. Maybe would have been able to negotiate the delivery and set up too. We paid cash... so that would have been a big enticement also and even more so now. Every thing costs money particularly moving and repairing older homes- and your time costs money too...
Good luck... and try to keep it enjoyable.