I have seen more than one moved and it is a pretty big undertaking, but far from impossible, and not so uncommon. People buy land and buy a new or used one and put them on, buy them new and place them, move from one trailer court to another. There are services that both move and set them.
I honestly have not heard of them not being able to be moved due to wiring, that is a new one to me but I suppose different states do vary.
In what I was talking about, it somewhat traps the owner and allows the trailer court to be guaranteed at least five years of lot rent, etc. The girl I talked about previously was well and truly stuck. It was an affordable option to her at the time but when she wanted out, there were few options. If I could have rented it out, even if I had to leave it on site and even if the renters had to be approved by the park, I would have bought it, but they nixed that option as well, even though they themselves rented units to people. Five years is a long time and much can happen, deaths, change of jobs, divorce--it seems pretty unfair to lock something in that long. If one buys a house and has a mortgage, at least one can always rent it if it cannot be sold.
Anyhow, it is probably not the case here but it is a thought. Perhaps if his practice was not doing so well he planned a move...